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Bigger 3TA?

Posted: Tue Aug 02, 2016 7:15 pm
by DAVE M2
You can convert 350 3ta's to 400cc (apparently!) and I believe that people use tiger cub Pistons ?

Anybody know any more? Is it viable on a road bike? It seems to be a trials thing.
What does it do? More torque? More speed? Standard cub or high compression Pistons?

Just interested really but I do have. Project in mind one day.....

Re: Bigger 3TA?

Posted: Tue Aug 02, 2016 9:40 pm
by Zunspec
Why not just fit a set of 500cc pistons/barrels.

Cheers Geoff

Re: Bigger 3TA?

Posted: Wed Aug 03, 2016 11:24 am
by DAVE M2
Because you need a 500 head and conrods as well.

The 3ta conrods are steel, 500 alloy. The 3ta little end is a different size but the same as a cub. Afaik you can ream the 350 conrod to fit 500 Pistons at a push.

Re: Bigger 3TA?

Posted: Thu Sep 08, 2016 8:35 pm
by paulcali3
I had a T90 (sporty 3TA) converted to 500cc. There was an alloy spacer under the barrel so I assume the builder used standard 3TA rods,T100 barrel & pistons. Worked. Good bike.

Re: Bigger 3TA?

Posted: Tue May 09, 2017 11:34 pm
by johnr
just out of casual intereest, ive got a t100a, is there any big bor conversions for this motor?

Re: Bigger 3TA?

Posted: Wed May 10, 2017 5:53 pm
by Zunspec
johnr wrote:just out of casual intereest, ive got a t100a, is there any big bor conversions for this motor?
Hi johnr,

None "off the shelf" that I know of, but I'm sure it could be done if you have the engineering skills.

Cheers Geoff

Re: Bigger 3TA?

Posted: Sat May 13, 2017 1:18 am
by johnr
im sure its doable but think i will leave it as it is. the little triumph motor does seem quite sweet and smooth like it is, i cant see how any tuning is going to improve it for the way i will ride it. i just wondered if there was an off the shelf mod for it, but its probably going to be a lot of work and hassle for very little gain.