1972 Marcos with 2,5 Triumph

[oilerfish]

Hi

New to this Board and hope someone can help out with a Triumph engine question

I recently purchased a factory built 1971 Marcos GT with a 2.5 Triumph engine. This is one of the eleven or
twelve that the factory made so not much info on mechanical's on the Marcos sites so hoping for some info here.

There was no history with the car when I bought it which is ok but now wondering if the motor may have
been hot-rod'ed to a larger degree than assumed when purchasing.

Looking at the motor ancillaries the engine has SAH valve cover, SAH carb manifolds, Weber 45 DCOE's, headers and finned deep sump aluminum oil pan.
What i'm wondering about without tearing the motor apart is if there is anyone with any idea of what SAH did to the internals (Cam etc.) when adding the above ancillaries?

I have done a bit of goggling and very little info on SAH

Thanks for any reply

Robert


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[//j17]

SAH were about the biggest after market tuning company for Triumphs back in the day and it sounds like your engine's had the full works - on the outside at least.

I'd actually recommend asking on one of the Triumph forums, either the TSSC or Club Trumph as my knowledge of SAH is limited to that and going "That SAH rocker cover on eBay sold for HOW much?!?!".

[chris59]

TR Register forum should be able to bring some help too.

Nice engine bay !

[tapkaJohnD]

Not just a Triumph Engine, from a TR6/2.5 saloon. Thats a Triumph top wishbone - froma a Herald or other 'small chassis' model, but I think, from its length, an upright from a TR6. From pics on the 'Net, Marcos used Triunmph front suspensiion a lot - and they were not the only ones.

[oilerfish]

Thanks for replying gents! Will have a go at the other sites.
Marcos did use a bunch of Triumph stuff on their autos. They also used Lucas however....
Engine was fired up for first time a few weeks ago after carb rebuild, what a sweet sound! May just have to keep it!

[oilerfish]

Thanks for replying gents! Will have a go at the other sites.
Marcos did use a bunch of Triumph stuff on their autos. They also used Lucas however....
Engine was fired up for first time a few weeks ago after carb rebuild, what a sweet sound! May just have to keep it!

[Mr Tiger]

That sounds like an exhilarating car you have. I congratulate and envy you!

I've found a one page article in the June 1971 edition of the gentleman's publication 'Club' which features an SAH tuned mk2 GT6.

The Club article states that SAH stands for Syd Hurrell (it doesn't mention the A), who started tuning two stroke Saabs before moving on to Triumph. The car in question had the stage 3 mods which included porting, gas flowing and machining of the head to raise the compression to 10.5:1. Competition valve springs, high lift cam, triple Weber 40DCOEs, oil cooler, NGK plugs, sports coil and what looks like twin exhausts. The article suggests the exhaust manifold was also changed. Back in 1971 it cost £278.50 including parts, labour, tuning and road testing. The figures claimed were 0-60 8.2 seconds, 0-100 24.9 seconds and top speed of 125 mph.

As suggested by //j17, you'd be lucky to get an SAH rocker cover for £278 these days.

It might be worth you posting on the Sideways Technlogies site. It has a wealth of knowledge, experience and enthusiasm for older cars especially tuned triumphs.

Does your engine have a tubular exhaust manifold?

Please post more photos.

Best of luck.

Chris

[//j17]

Just had a quick google and an SAH rocker cover for the 4-cylinder Triumph engine sold on eBay back in Jan for £495. I'd bet they sold a lot more of the 4 than 6 cylinders covers so dread to think what a 6-cylinder one would sell for.