MG-Cars.net

Welcome to our resource for MG Car Information.

Recommendations

Parts

TR parts and Triumph parts, TR bits, Triumph Car Spares and accessories are available for TR2, TR3, TR3A, TR4, TR4A, TR5, TR6, TR7, TR8, Spitfire and Stag and other TR models are available from British car spares and parts company LBCarCo.

Triumph TR6 - High(er) Performance Mods

Anyone used larger than stock valves in a rebuild? Revington and TRF both offer "high" performance parts. Revington's are packaged Level 1-4 with 1 being a fast street and 4 a race track only. Among the upgrades are a choice of both intake and exhaust valves with increased surface area. The seats have to be specially cut to accept the larger valves but I assume more fuel/air in the chamber, more power, but I know enough to know that this is not necessarily the case unless other complementary mods are also pursued such as smoothing the flow in-out, optimizing the timing and overlap etc which means the right cam, springs, push rods, etc. Gotta buy valves anyway so why not upgrade for a few bucks more?? Need to assess the full impact and am short on gray matter to wrap all this in a optimized executable package. Thanks. Comments??
db
Doug Baker

Are you changing to a different carb set up?
DON KELLY

No, twin ZU 175's, overhauled, tweaked, balanced and whatever else I can do to them to optimize their performance. No intent to go to triple Webers.

Will/have ported and polished insofar as I can accomplish with the manifold/head interfaces and within the combustion chamber. No real changes to the bottom end, just repair/replace bearings/bushings/bolts/etc. Am balancing the rotating mass and across the cylinders. New alloy flywheel and am considering an alloy pulley and maybe a new harmonic balancer on the front although, so far, the analysis does not justify the cost. Single exhaust; no headers.
db
Doug Baker

Then the bigger valves won't do you anything.
Bigger valves a big help in big cam and high revving motors.
Just have all the ports polished and opened to the correct size. That's about all you need.
I'm sure Steve will chime in on this if I am wrong.
DON KELLY

Doug ,
Larger valves alone will probably not give an increase in either power or torque unless suitable other modifications are also employed to take advantage of the increased gas volume allowed by the increased valve area. This you have already mentioned.

One method is to calculate the percentage increase in valve areas of the original and the intended modification. This will give a guideline as to the expected increase available but remember it IS only a guideline and other factors like gas flow speed etc. will play a part.

Personally I would spend the money on either better quality valves or standard items and a rolling road / chassis dyno test session to optimize what you already have.

Good luck , Pete.

Peter Thomas

Uh...Don, Pete, forgot to mention that I'm shaving the head to get to 9.5:1 CR from 8.5:1. Will that change things, i.e. make the larger valves of value? My objective is a highly reliable/durable engine with performance optimized inside that parameter. Thanks.
db
Doug Baker

I still say just have it ported and polished.
DON KELLY

Thanks Don.
db
Doug Baker

Doug,

If you have not modified your head chambers, larger valves might actually reduce the flow, given how much of the valves are shrouded by the chamber.

Take a look at the space between the valve and the side of the stock chamber and you will find it is pretty small. What you will gain on the open side of the valve, you might lose on the closed side.

My $0.02; Canadian $ so discount accordingly,

Len
Leonard G Middleton

Doug,
According to David Vizard the change from the original 8.5 to 9.5 will net an increase of around 3% with no other mods.
Worth having but I am not sure this will be a major increase for you.
It may give a more responsive feel to the right foot though.

If you are looking at durability then I would be looking at "blueprinting" the engine for that and then optimising using a chassis dyno after break in.

By the way do you have the valve diameters (before and after) and the bore / stroke of the engine handy?

Given the exact numbers I can work out the ball park expected power increases.

Cheers , Pete.
Peter Thomas

Pete,
Thanks for the offer. I have those data, but will have to hunt 'em up.
db
Doug Baker

Here is a suggestion for you Doug....

Rick Crawford

Rick,
Already thought of that, but that BIG BUCKS!! Maybe down the road a piece.
db
Doug Baker

Rick,

That big SU looks better to my eye than Moss's Holley. Whose setup is this? (Not that I can afford it either, at this point...)

Ken
k v morton

Probably an SU 8. If your gonna do that might as well run it thru a throttle body
DON KELLY

Ken
Just a pic of a TR6 on CDII. Not sure of who makes it but it looks like the same unit I have seen on many a TR. Maybe someone else can answer the question.

Yes Doug expensive...I think around $5000 but good bang for your buck.

Rick
Rick Crawford

Is this not the MOSS super charger? Fooled me!!
db
Doug Baker

I suppose it is the one from MOSS Doug. Still a pretty unit and lots of extra power. Does fit very well into the bonnett of a TR6. Kinda looks like it belongs there:)

Rick
Rick Crawford

Doug,
The Moss kit uses a downdraft Holley.
The shot I included is Sam Bass TR6, from Everett, WA. He puts a lotta miles on this car every summer. Been very reliable, and he sez it gets out of the way of trucks right now! On the other hand, he just bought a box-stock Triumph Herald last fall, is planning to drive it over here to our annual "Summer Tour". Hope he stays clear of trucks with that Herald!
Rod

Rod Nichols

Rod
The more I see one of them, the more I want one. They really do look nice.

Rick
Rick Crawford

You remember David's ?


DON KELLY

Yeah, I like the looks of the SU. The Moss kit with the Holley has a differently-shaped casting on the drive end of the blower as well. I think the Moss kit is under $3500, but that's still too rich for me. Guess I should have thought of that before I added a TR8 to the fleet!

Ken
k v morton

Your picture of your 8. Was it taken at Portland ABFM?
DON KELLY

Guy's I might be wrong , but I think that is a Sal Vesperito kit. He makes the manifold and other custom pieces and you find your own blower and carb. It uses the same Eaton blower as the Moss kit. I think.

Rob
rw loftus

Don
Yup I do. I think you took the pic of David taking me for a drive.

Really nice motor.

Rick

Rick Crawford

Corection, it Sal Vespertino. His kit bolts up to the stock intake manifold. Among other things, the kit includes adapters for the carb to blower, and blower
to manifold.

Rob
rw loftus

Don,

Photo of my 8 taken at the Portland Historics in July, before I bought it.

Ken

k v morton

The historics are in Sept. ,Unless it is a real old photo
DON KELLY

Portland Historic Races are in July, the SOVREN Columbia River Classic races are in September with the ABFM.
k v morton

In surfing for info on another TR6 subject stumbled across this site. Within "Procedures" there is resource material on higher performance. I apologize if you are all familiar with this site already. It was new to me so I've bookmarked it.

Ken

http://www.tr6web.com/tr6.html


Ken Shaddock

Ken
No need to apologize. This WEB site has been around since late 90s. Disappeared for a while then came back.
J.B. Zimmerman's WEB page was the inspiration for me to start the infamous CDI. Then came help from Doug.
If you look at his PROCEDURES you will notice I DID NOT reinvent the wheel.
Everything in CDI and CDII came from the Internet. A lot that is on CDII is just not on the Internet any more due to legal ramifications in telling someone how to fix something and hurting themselves in the process.

How is the weather down there Ken?

But then maybe I do not want to hear it....:)

Rick
Rick Crawford

Hi Rick

Only two rainy days since Jan 14 but not always warm. Let's put it this way... had I brought the 6 down I would have only missed two days of driving and / or working on the car... many if not all, with the top down. Three campers down our neighbours hauled a 40' toybox... 1/2 camper 1/2 garage and inside the garage a '26 T pick-up with a Chevy 4cyl. It was sweet and out and about every day!

Ken
Ken Shaddock

K V I You are right and I stand corrected.




Damn I hate that!
DON KELLY

Don, have you seen my 8 before at the ABFM? I'm planning to be there with it this year.

Back to the blower, I remember an article years ago, maybe in British Car before it became Classic Motorsports, about a guy who bought a supercharger from Eaton and built his own TR6 manifold adaptor, etc, for a whole lot less money than the kits on the market. And of course, some scroungers have found used superchargers in the wrecking yard or on Ebay for even less. Maybe when I retire I'll have time for that! But then I think about the relative ease of buying the kit; guess I'll just have to work a few more years.
k v morton

Hi all,

I installed Sal Vespertino's kit in my stock 74 TR6 almost 4 years ago and have enjoyed every minute behind the wheel. It is the only way to go (IMHO). If you don't put your foot into it, it acts and sounds like a stock 6. But, when you kick in the supercharger, it really goes. Works best on a completely stock engine. Bolts on in less than one weekend. Costs less than Moss.

John in Kansas

John Korsak

Been at the last 4or 5 ABFM's. The last one the first with my Wedge. Was treated like it had TB. Another member of this forum has felt the same way about Portland and has avoided it like the plague. I think I will give it a shot again . Will be a busy summer with possibility of Bellevue,Portland and the ATDI in Redmond OR too.
DON KELLY

Do not forget to turn up the sound !
http://www.youtube.com/watch?v=BO3gDDBXuiM
Erik Creyghton

John,

Is Sal's kit commercially available?

Ken
k v morton

Check out this UTube video if you want to see and hear what a supercharged TR6 can do. I think Sal still sells his kit. You can reach him at Salva57@optonline.net.

John http://www.youtube.com/watch?v=8jjTUQOZR7I
John Korsak

Or this:
http://i2.photobucket.com/albums/y17/billkaram/bay.jpg
BK Karam

Who ever contacts Sal V. please report back here whith info on his kit.

Thanks
Rick
Rick Crawford

This thread was discussed between 29/01/2009 and 24/02/2009

Triumph TR6 index

This thread is from the archive. The Live Triumph TR6 BBS is active now.