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TR6 TR6 Engine Mods

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Mike_Roe

Mike_Roe

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Looking for some advice: My '76 TR6 is due for a rebuild (200,000 miles on original engine) and I'd like to increase the torque/hp reliably, yet not make the car a high-strung racer. I'm thinking either triple stromberg and G2 cam from Richard Good, or Supercharger. Any advice on which is the best route from a $/hp perspective? Either one better for reliability and longevity?

Thanks,

Mike Roe
'68 GT6
'71 Stag
'76 TR6
 
TR6Bill had a sweet 6 with triple ZS's. He still haunts the forum, and will probably check in.

Couple other folks have had some experience, and will be along by and by...

Mickey
 
Mike -- your rebuilt '76 would be a great candidate for a supercharger assuming you retain the original low compression. You would see a big increase in torque and horsepower when you mash the pedal, and normal behavior when you are idling or driving conservatively. Unfortunately, the supercharger suppliers are dwindling. I wanted to put one of Sal Vespertino's supercharger kits on my '76. Two months after I paid him he emailed saying the blowers were no longer available, and promptly refunded my money. This just happened last week.

My second choice was Bennet French (d/b/a Standard Performance, or thebritishconnection on Ebay), so I went to his web site and Ebay store, only to find that he is apparently getting out of supplying parts. This notice appeared on one of his recent Ebay listings: "I am clearancing all my remaining stock of Triumph parts and will be concentrating on the engine building side of the business. I will still be able to special order many of the items I have had listed on here in the past and have them drop shipped to you. If you are looking for something in particular please don't hesitate to call for price and availability."

The only other kit I know of is Moss, and that one is nearly $4000. I've taken this all as a sign that the Almighty doesn't want me to put a supercharger on my TR6.

Best wishes with your motor rebuild. Scott
 
To rebuild your TR6 to accept a Moss supercharger, the engine needs to be in really good shape. So, take the cost of a complete rebuild with quality parts and add the $4K cost of a Moss supercharger and you are looking at between 6 and 8 thou. Take the same monies and do a complete rebuild to factory specs, using a quality rebuilder, super-tune your engine with a tweeked dizzy, some high quality ZS carbs and other simple but not radical improvements, and you will have a spirited TR6 that retains its intrinsic value more than a modified car. A radical engine takes a lot of tweeking. A sweet stock engine, much less. I say stay stock-ish.
 
I'm thinking that Bill has an S2 cam.
Here's a shot of the outside of Bill's engine.
100_0990.jpg
 
Thanks a bunch for the comments! I had no idea the supercharger was becoming scarce. Makes me think twice, since replacement parts would be hard to find.

Thanks again!
 
I am just finishing up a re-build and modest performance upgrade to a TR250 engine.

Here are the rough costs so far.

Head milled .090, hardened exhaust seats, exhaust valve seals, $450.
New rocker arms, push rods, springs, tappets, and rocker shaft, $435.
Engine cleaned and bored .030", crank polished, $350.
Flywheel surfaced, and new clutch and pressure plate, and TO bearing $370.
Pistons, GP2 cam, rod bearings, main bearings, thrust washers, timing gear and chain set, and gaskets, $960.

Other items like spin on oil filter adapter, bolts, nuts, paint harmonic damper re-built, starter and generator re-build ~$500.

Not yet done is the carburetor and linkage build, and fuel pump kit.

All in all about $4,023 in parts and machining so far, and I did all the disassembly and assembly work.

In the end, I will get some boost in performance for about $500 over a stock build.

Oh, I the original TR6 engine I planned to build needed a crank grind for around $300 and the cam bearings bored and inserts installed for another $500-600 had I chose to do that engine.

I was also fortunate in that I had a near new distributor and oil pump, or the cost for new or re-built would have added to the cost.

For another $600, I could go with triples, then another $400+ for a manifold, but I said to myself, "Self, you are 63 years old so how fast will you really drive this car? Enough is enough.", but I got some.
 
Ray,

After tweaking you will be fine with the twin ZS carbs. You have a nice build going there. Keeps us updated on the progress.
 
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