TA Pistons

[Monoxidemanor@aol.com]

Dear Kimberites: We are looking for a source for pistons for our TA with original MPJG engine. Hopefully this question will not be answered by directing us to some page in Malcolm Green's book again. Kindest regards, Alan & Victoria Campbell

[Ray]

There are a couple of companies who make pistons to your pattern here in the US. I had some made for a Coventry Climax for about 250 bucks. Best, Ray

----- Original Message ----- From: Monoxidemanor@aol.com> To: mg-tabc@yahoogroups.com> Sent: Sunday, October 21, 2001 4:38 PM Subject: [mg-tabc] TA Pistons > Dear Kimberites: > > We are looking for a source for pistons for our TA with original MPJG engine. > Hopefully this question will not be answered by directing us to some page in > Malcolm Green's book again. > > Kindest regards, > > Alan & Victoria Campbell > > > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ > >

[MG1948@aol.com]

Cox & Turner Engineering in England can supply you with NOS pistons. They are @ www.coxturner.freeserve.co.uk Phone # 01425 652627 Nice people to do business with. Phil

[Robert Grunau]

I have had good success using Venolia pistons ( from California ) in my race MG TC. The pistons are solid skirt and strong. They will make the piston to your size and specification. Therefore you do not need to simply go to the next "commercial" size. You can specify a piston size that will allow you to bore the block the minimum required to get a clean bore in the block. You should know what type of connecting rod you are going to use before proceeding as the wrist pin can be either full floating or clamped in the rod end. A different wrist pin with circlips would be used in a modern reproduction rod with full floating little end. Also size of the pin could vary if buying a more modern connecting rod. Standard type MPJG pistons are available in Standard, +0.030" and +0.060" sizes from England. Regards, Bob Grunau There are a couple of companies who make pistons to your pattern here in the US. I had some made for a Coventry Climax for about 250 bucks. Best, Ray

> Dear Kimberites: > > We are looking for a source for pistons for our TA with original MPJG

engine.

> Hopefully this question will not be answered by directing us to some page

in

> Malcolm Green's book again. > > Kindest regards, > > Alan & Victoria Campbell > > > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ > >

Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

[C Sherriff]

Message text written by INTERNET:MG1948@aol.com

>Cox & Turner Engineering in England can supply you with NOS pistons.

They are @ www.coxturner.freeserve.co.uk Phone # 01425 652627 Nice people to do business with. Philhttp://www.coxnturner.freeserve.co.uk/ Regards Clive Oxford UK

[Chip Old]

On Sun, 21 Oct 2001, Robert Grunau wrote:

> [snip] > You should know what type of connecting rod you are going to use > before proceeding as the wrist pin can be either full floating or > clamped in the rod end. A different wrist pin with circlips would be > used in a modern reproduction rod with full floating little end. Also > size of the pin could vary if buying a more modern connecting rod. > [snip]

Speaking of which, what is the current thinking on replacement connecting rods for a high-performance XPAG/XPEG? The last time I built an XPAG intended for racing was so long ago, the usual practice was to use XPEG rods. -- Chip Old 1948 M.G. TC TC6710 XPAG7430 NEMGTR #2271 Cub Hill, Maryland 1962 Triumph TR4 CT3154LO CT3479E fold@bcpl.net

[Robert Grunau]

XPEG rods are considered too heavy and can result in rod bearing failure at high RPM due to increased centrifugal forces. Also the wrist pin clamp bolt is considered a weakness. I use a modern full floating connecting rod which does away with the little end clamp bolt ) and uses modern cap screws on the lower end. If using a good crankshaft, rev limit of the engine is raised to about as high as you want to go, at least as far as the rods and crank are concerned. Bob Speaking of which, what is the current thinking on replacement connecting rods for a high-performance XPAG/XPEG? The last time I built an XPAG intended for racing was so long ago, the usual practice was to use XPEG rods. -- Chip Old 1948 M.G. TC TC6710 XPAG7430 NEMGTR #2271 Cub Hill, Maryland 1962 Triumph TR4 CT3154LO CT3479E fold@bcpl.net

[Chip Old]

On Tue, 23 Oct 2001, Robert Grunau wrote:

> XPEG rods are considered too heavy and can result in rod bearing > failure at high RPM due to increased centrifugal forces. Also the > wrist pin clamp bolt is considered a weakness. I use a modern full > floating connecting rod which does away with the little end clamp bolt > and uses modern cap screws on the lower end. If using a good > crankshaft, rev limit of the engine is raised to about as high as you > want to go, at least as far as the rods and crank are concerned.

Are the rods special-made for the XPAG, or are they adapted from some modern engine? What's the source? -- Chip Old 1948 M.G. TC TC6710 XPAG7430 NEMGTR #2271 Cub Hill, Maryland 1962 Triumph TR4 CT3154LO CT3479E fold@bcpl.net

[C Sherriff]

Message text written by Chip Old

>Are the rods special-made for the XPAG, or are they adapted from some

modern engine? What's the source?

[Robert Grunau]

The rods and crank are special made for the XPAG engine. I use a special crankshaft and connecting rods made by Phoenix in England. The crank has oversize rod journals ( 1.875" diameter ) to accept 5 main bearing MGB connecting rod bearings and the rods are also oversized with MGB lower ends and cap bolts. This gives the advantage of a stronger, stiffer crankshaft and also the use of modern steel backed copper lead with lead indium precision plated overlay rod bearings. The small end of the rod is full floating with an 18 mm wrist pin. Bob Grunau.

On Tue, 23 Oct 2001, Robert Grunau wrote: > XPEG rods are considered too heavy and can result in rod bearing > failure at high RPM due to increased centrifugal forces. Also the > wrist pin clamp bolt is considered a weakness. I use a modern full > floating connecting rod which does away with the little end clamp bolt > and uses modern cap screws on the lower end. If using a good > crankshaft, rev limit of the engine is raised to about as high as you > want to go, at least as far as the rods and crank are concerned. Are the rods special-made for the XPAG, or are they adapted from some modern engine? What's the source? -- Chip Old 1948 M.G. TC TC6710 XPAG7430 NEMGTR #2271 Cub Hill, Maryland 1962 Triumph TR4 CT3154LO CT3479E fold@bcpl.net Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/