New To The Market: Triumph T90 & 3TA Pistons
Should you be rebuilding a vintage Triumph motorcycle, you might find that most parts are still available on the market today, whether new, used, or new old stock
If you are building (or rebuilding) a vintage Triumph 350 twin you might find that parts are harder to obtain as compared to its cousins the 500, 650 and 750 twin
Today we would like to introduce to you a new part for 2020 that will make rebuilding your little Triumph 350 much easier
Triumph 350 pistons
The Triumph 3TA or T90 models where the first unit construction twin to ever be designed and leave the Meriden factory back in 1957
It was a new design that paved the way for future engines from the TR6, T120, and T100
Although the Triumph 350 was made for about 10 years, there are a few parts that are extremely hard to find
- Piston assembly's (7.5:1 & 9:1)
- Rings
Lucky for us, L.F. Harris in England has decided to take on the task of making new piston assembly's to fill this void
The details
Each piston is cast-aluminum and are made to the same specs as the originals
We currently have two types of piston assembly's in various sizes and compression ratios (7.5:1 & 9:1)
- STD (Standard)
- +.020
- +.040
- +.060
L.F. Harris pistons are extremely high quality, in fact, when compared to original pistons, we have found that L.F. Harris pistons are more consistent than original Triumph pistons (weight, dimensions, material, etc)
All piston assembly's come in there own convenient and protective box for added care upon delivery
7.5:1 Piston assembly
The 7.5:1 type piston was fitted to all Triumph T21 and 3TA models from 1957-1965
Features a shallow style dome but designed to make your engine more efficient, cooler and reliable
Gudgeon pins, clips and rings are all included
Click here to view or purchase our 7.5:1 piston assembly
9:1 Piston assembly
The 9:1 type piston was fitted to all Triumph T90 models from 1963-1968
Features a higher dome to achieve more compression, power and overall performance
T90 pistons can also be used in T21 and 3TA motors as 350 cylinder heads are all interchangeable despite compression ratios
enter photo
Gudgeon pins, clips and rings are all included
Click here to view or purchase our 9:1 piston assembly
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Thanks for reading!
Richard Wright
To benefit from using the 9.1 pistons you should change the camshaft to t90 spec also.
T90 also used a larger carb
Classic British Spares
@Steve – I would imagine that you would see an increase. Running higher octane gas might be wise
steve
Hi. I am going to fit new pistons in my 1964 triumph 3ta.
If I were to use 9:1 pistons would I see any increased performance or would it be better to stay with standard 7.5:1 compression.
Any help would be appreciated. Thanks.