Engine overhaul - advice

[scooter19392003]

Sorry for butting in here, but I really do not give a continental what the 'Royals' drive and the demise of MG Rover, even though I own a MGF VVC, is not of concern to most MG-TABC owners and certainly not this group. My trusty steed TC 9298 needs an engine overhaul. Oil pressure down and compression varying from 80 to 110, plus uses oil and lacks power etc. Leaded and leaded replacement fuel is no longer available in Australia so I will convert the engine to unleaded fuel as part of the overhaul. However, it occurred to me that in addition to reconditioning the engine I might perhaps 'upgrade' it somewhat. I do not want to supercharge it or change the carbs, but am considering the following: 1) Shaving the head somewhat - how much? 2) Installing larger valves 3) Boring the motor whether it needs it or not? 4) Blueprinting the 11/4 inch SU's 5) Better cam - although Mike Sherell says the standard cam is pretty good? 6) Leave manifolds standard? 7) Match and polish ports Is the above worth doing? Should I do more? Less? The car is used in rallies and social runs, some of them over several days, but is not used in competition. I run 4 40 19" tyres. Looking forward to your opinions and advice Aubrey TC 1949

[Donald Wilkinson]

Hey Aubrey: digitaldon wonders why you wanna limit yerself to the 1 1/4" carbies, as this negates most of the breathing mods you mention. As yer engine is worn, you'll certainly want a rebore. As to cams, stock is OK, but a modern cam (such as Crane) is better, metallurgically as well as design-wise (IHHO). Matching & polishing ports can't hurt. If yer head is full thickness, digitaldon sez: KEEP IT LIKE THAT! (You may wanna apply forced induction later, the only way to go, again IHHO). You kin always find butchered (shaved) heads, but it's difficult to go back. Don TC 7993 Sorry for butting in here, but I really do not give a continental what the 'Royals' drive and the demise of MG Rover, even though I own a MGF VVC, is not of concern to most MG-TABC owners and certainly not this group. My trusty steed TC 9298 needs an engine overhaul. Oil pressure down and compression varying from 80 to 110, plus uses oil and lacks power etc. Leaded and leaded replacement fuel is no longer available in Australia so I will convert the engine to unleaded fuel as part of the overhaul. However, it occurred to me that in addition to reconditioning the engine I might perhaps 'upgrade' it somewhat. I do not want to supercharge it or change the carbs, but am considering the following: 1) Shaving the head somewhat - how much? 2) Installing larger valves 3) Boring the motor whether it needs it or not? 4) Blueprinting the 11/4 inch SU's 5) Better cam - although Mike Sherell says the standard cam is pretty good? 6) Leave manifolds standard? 7) Match and polish ports Is the above worth doing? Should I do more? Less? The car is used in rallies and social runs, some of them over several days, but is not used in competition. I run 4 40 19" tyres. Looking forward to your opinions and advice Aubrey TC 1949

[1939mgtb]

Amen to the digitalcomments. Best regards, Ray "There are no easy answers in this case m'lud."

----- Original Message ----- From: "Donald Wilkinson" digitaldon@hotmail.com> To: rockdctr@hotmail.com>; mg-tabc@yahoogroups.com> Sent: Wednesday, April 13, 2005 1:51 AM Subject: RE: [mg-tabc] Engine overhaul - advice > > Hey Aubrey: > > digitaldon wonders why you wanna limit yerself to the 1 1/4" carbies, as > this negates most of the breathing mods you mention. As yer engine is > worn, > you'll certainly want a rebore. As to cams, stock is OK, but a modern cam > (such as Crane) is better, metallurgically as well as design-wise (IHHO). > Matching & polishing ports can't hurt. If yer head is full thickness, > digitaldon sez: KEEP IT LIKE THAT! (You may wanna apply forced induction > later, the only way to go, again IHHO). You kin always find butchered > (shaved) heads, but it's difficult to go back. > > Don > TC 7993 > > > Sorry for butting in here, but I really do not give a continental > what the 'Royals' drive and the demise of MG Rover, even though I > own a MGF VVC, is not of concern to most MG-TABC owners and > certainly not this group. > > My trusty steed TC 9298 needs an engine overhaul. Oil pressure down > and compression varying from 80 to 110, plus uses oil and lacks > power etc. Leaded and leaded replacement fuel is no longer > available in Australia so I will convert the engine to unleaded fuel > as part of the overhaul. However, it occurred to me that in > addition to reconditioning the engine I might perhaps 'upgrade' it > somewhat. I do not want to supercharge it or change the carbs, but > am considering the following: > > 1) Shaving the head somewhat - how much? > 2) Installing larger valves > 3) Boring the motor whether it needs it or not? > 4) Blueprinting the 11/4 inch SU's > 5) Better cam - although Mike Sherell says the standard cam is > pretty good? > 6) Leave manifolds standard? > 7) Match and polish ports > > Is the above worth doing? Should I do more? Less? The car is used > in rallies and social runs, some of them over several days, but is > not used in competition. I run 4 40 19" tyres. > > Looking forward to your opinions and advice > > Aubrey > TC 1949 > > > > > > Yahoo! Groups Links > > > > > > >

[Bob Grunau]

I would raise the CR a bit, maybe to 8.3 or 8.5 range. In addition, a lightened flywheel will give you better acceleration, see my drawing on T-ABC technical. I have TF valves and hard seats, TC valve springs, Crane cam, 9.0 CR ( it just came out that way from previous head shavings ), 1 1/4" carbs and standard air cleaner and 4.55 diff on my road TC, works great. I think the 1 1/2" carbs only help with power at high revs, over 4,500?? May be detrimental at low revs due to poor gas flow? Results in loss of torque?. 1 1/2" carbs not likely required on this TC. I would also recommend a higher ratio diff, 4.625 or 4.55 ratio work great. Bob Grunau digitaldon wonders why you wanna limit yerself to the 1 1/4" carbies, as this negates most of the breathing mods you mention. As yer engine is worn, you'll certainly want a rebore. As to cams, stock is OK, but a modern cam (such as Crane) is better, metallurgically as well as design-wise (IHHO). Matching & polishing ports can't hurt. If yer head is full thickness, digitaldon sez: KEEP IT LIKE THAT! (You may wanna apply forced induction later, the only way to go, again IHHO). You kin always find butchered (shaved) heads, but it's difficult to go back. Don TC 7993 My trusty steed TC 9298 needs an engine overhaul. Oil pressure down and compression varying from 80 to 110, plus uses oil and lacks power etc. Leaded and leaded replacement fuel is no longer available in Australia so I will convert the engine to unleaded fuel as part of the overhaul. However, it occurred to me that in addition to reconditioning the engine I might perhaps 'upgrade' it somewhat. I do not want to supercharge it or change the carbs, but am considering the following: 1) Shaving the head somewhat - how much? 2) Installing larger valves 3) Boring the motor whether it needs it or not? 4) Blueprinting the 11/4 inch SU's 5) Better cam - although Mike Sherell says the standard cam is pretty good? 6) Leave manifolds standard? 7) Match and polish ports Is the above worth doing? Should I do more? Less? The car is used in rallies and social runs, some of them over several days, but is not used in competition. I run 4 40 19" tyres. Looking forward to your opinions and advice Aubrey TC 1949

[Jim and Shirley Mink]

I agree with Bob, bigger is not always better, especially when it comes to carbs. Have a friend who spent a lot of time and money putting 11/2 carbs on his TC. The result, less performance except at very high revs. He went back to the 11/4 carbs. Jim

[Rick Waters]

I went through this a while ago. I obtained a second engine block, which I had bored and sleeved to 72 mm (1466 cc). I installed the moss-forged crank, and new standard-sized valves. All new fasteners for peace of mind. I had the engine/clutch assembly balanced. The change in bore, with standard-thickness head, gives a compression ratio of about 8.4 to one, I believe. I have not yet experimented with advancing the ignition timing, but plan on this soon. With 1 1/4 carbs, this car produces a lot of torque! You mentioned rallys and social events. Torque is what you want for this, not high rpm horsepower. Subsequent to the rebuild, I installed the Crane Cam (you just have to look at one next to an old XPAG cam to see the wider lobes and larger base circle), and the 4.625 rear gears. The difference is like night and day. I can still start in second gear if I want, and the car pulls up moderate hills from 1700rpm in fourth gear, but it's so much more pleasant to drive in all gears, and not just at highway speeds. To test a wheel balance job, I took it up to 4500 rpm in 4th gear, (77 mph) and there was lots left. -TC 7881 scooter19392003 rockdctr@hotmail.com> wrote: Sorry for butting in here, but I really do not give a continental what the 'Royals' drive and the demise of MG Rover, even though I own a MGF VVC, is not of concern to most MG-TABC owners and certainly not this group. My trusty steed TC 9298 needs an engine overhaul. Oil pressure down and compression varying from 80 to 110, plus uses oil and lacks power etc. Leaded and leaded replacement fuel is no longer available in Australia so I will convert the engine to unleaded fuel as part of the overhaul. However, it occurred to me that in addition to reconditioning the engine I might perhaps 'upgrade' it somewhat. I do not want to supercharge it or change the carbs, but am considering the following: 1) Shaving the head somewhat - how much? 2) Installing larger valves 3) Boring the motor whether it needs it or not? 4) Blueprinting the 11/4 inch SU's 5) Better cam - although Mike Sherell says the standard cam is pretty good? 6) Leave manifolds standard? 7) Match and polish ports Is the above worth doing? Should I do more? Less? The car is used in rallies and social runs, some of them over several days, but is not used in competition. I run 4 40 19" tyres. Looking forward to your opinions and advice Aubrey TC 1949 Yahoo! Groups Links -Rick Waters --------------------------------- Post your free ad now! Yahoo! Canada Personals [Non-text portions of this message have been removed]

[scooter19392003]

Thanks Bob, will consider the lightening the flywheel - had not thought of that - have already installed a 4.55 diff and will be installing the larger valves and hard seats. Thanks again Aubrey TC 9298 --- In mg-tabc@yahoogroups.com, "Bob Grunau" wrote:

> I would raise the CR a bit, maybe to 8.3 or 8.5 range. > In addition, a lightened flywheel will give you better

acceleration, see my

> drawing on T-ABC technical. > I have TF valves and hard seats, TC valve springs, Crane cam, 9.0

CR ( it

> just came out that way from previous head shavings ), 1 1/4" carbs

and

> standard air cleaner and 4.55 diff on my road TC, works great. > I think the 1 1/2" carbs only help with power at high revs, over

4,500?? May

> be detrimental at low revs due to poor gas flow? Results in loss

of torque?.

> 1 1/2" carbs not likely required on this TC. > I would also recommend a higher ratio diff, 4.625 or 4.55 ratio

work great.

> Bob Grunau > > digitaldon wonders why you wanna limit yerself to the 1 1/4"

carbies, as

> this negates most of the breathing mods you mention. As yer

engine is worn,

> you'll certainly want a rebore. As to cams, stock is OK, but a

modern cam

> (such as Crane) is better, metallurgically as well as design-wise

(IHHO).

> Matching & polishing ports can't hurt. If yer head is full

thickness,

> digitaldon sez: KEEP IT LIKE THAT! (You may wanna apply forced

induction

> later, the only way to go, again IHHO). You kin always find

butchered

> (shaved) heads, but it's difficult to go back. > > Don > TC 7993 > > > My trusty steed TC 9298 needs an engine overhaul. Oil pressure

down

> and compression varying from 80 to 110, plus uses oil and lacks > power etc. Leaded and leaded replacement fuel is no longer > available in Australia so I will convert the engine to unleaded

fuel

> as part of the overhaul. However, it occurred to me that in > addition to reconditioning the engine I might perhaps 'upgrade' it > somewhat. I do not want to supercharge it or change the carbs, but > am considering the following: > > 1) Shaving the head somewhat - how much? > 2) Installing larger valves > 3) Boring the motor whether it needs it or not? > 4) Blueprinting the 11/4 inch SU's > 5) Better cam - although Mike Sherell says the standard cam is > pretty good? > 6) Leave manifolds standard? > 7) Match and polish ports > > Is the above worth doing? Should I do more? Less? The car is used > in rallies and social runs, some of them over several days, but is > not used in competition. I run 4 40 19" tyres. > > Looking forward to your opinions and advice > > Aubrey > TC 1949

[David Lodge]

Hello Aubrey, The list got very lively on this subject last year and the consensus, I believe, was that a blower gave one the most splendid bang for one's buck! Good luck, David Lodge ----- ORIGINAL MESSAGE ----- From: "1939mgtb" 1939mgtb@comcast.net> To: rockdctr@hotmail.com,mg-tabc@yahoogroups.com,"Donald Wilkinson" digitaldon@hotmail.com> Subject: Re: [mg-tabc] Engine overhaul - advice Date: 13.4.2005 - 15:24:07

> > Amen to the digitalcomments. > Best regards, > Ray > "There are no easy answers in this case m'lud." > > ----- Original Message ----- > From: "Donald Wilkinson" digitaldon@hotmail.com> > To: rockdctr@hotmail.com>; mg-tabc@yahoogroups.com> > Sent: Wednesday, April 13, 2005 1:51 AM > Subject: RE: [mg-tabc] Engine overhaul - advice > > > > > > Hey Aubrey: > > > > digitaldon wonders why you wanna limit yerself to the > > 1 1/4" carbies, as > > this negates most of the breathing mods you mention. > > As yer engine is > > worn, > > you'll certainly want a rebore. As to cams, stock is > > OK, but a modern cam > > (such as Crane) is better, metallurgically as well as > > design-wise (IHHO). > > Matching & polishing ports can't hurt. If yer head > > is full thickness, > > digitaldon sez: KEEP IT LIKE THAT! (You may wanna > > apply forced induction > > later, the only way to go, again IHHO). You kin > > always find butchered > > (shaved) heads, but it's difficult to go back. > > > > Don > > TC 7993 > > > > > > Sorry for butting in here, but I really do not give a > > continental > > what the 'Royals' drive and the demise of MG Rover, > > even though I > > own a MGF VVC, is not of concern to most MG-TABC > > owners and > > certainly not this group. > > > > My trusty steed TC 9298 needs an engine overhaul. > > Oil pressure down > > and compression varying from 80 to 110, plus uses oil > > and lacks > > power etc. Leaded and leaded replacement fuel is no > > longer > > available in Australia so I will convert the engine > > to unleaded fuel > > as part of the overhaul. However, it occurred to me > > that in > > addition to reconditioning the engine I might perhaps > > 'upgrade' it > > somewhat. I do not want to supercharge it or change > > the carbs, but > > am considering the following: > > > > 1) Shaving the head somewhat - how much? > > 2) Installing larger valves > > 3) Boring the motor whether it needs it or not? > > 4) Blueprinting the 11/4 inch SU's > > 5) Better cam - although Mike Sherell says the > > standard cam is > > pretty good? > > 6) Leave manifolds standard? > > 7) Match and polish ports > > > > Is the above worth doing? Should I do more? Less? > > The car is used > > in rallies and social runs, some of them over several > > days, but is > > not used in competition. I run 4 40 19" tyres. > > > > Looking forward to your opinions and advice > > > > Aubrey > > TC 1949 > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > >

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