triumphs
[Top] [All Lists]

TR4 vs 3 engine

To: triumphs@autox.team.net
Subject: TR4 vs 3 engine
From: Jim Wallace <wallaces@superaje.com>
Date: Sun, 22 Aug 2004 12:03:55 -0400
I have a TR3a, whose engine I have rebuilt with 87.2 mm pistons and liners, 
but which is otherwise stock. This has not been installed in the car.
Yesterday I got an engine that looks to be from a TR4, although there are 
some odd bits on it that make me wonder if it was from some other car 
(separate issue).
Anyway - I have heard that the TR4 manifolds and the HS6 carbs are "better" 
and could pretty easily switch these over (I am aware that I would need to 
do some bodywork to accommodate this).
So question 1 is: what is the improvement supposed to be? hp, torque? I can 
see where gas flow is better but is it worth it?
Also there is the different cam. Since I have upped my displacement from 2 
to 2.2 litres without doing any modifications to the head (besides new 
stellite-faced valves), compression is now about 10.3.
So question 2 is: should I swap in the TR4 cam, assuming it's in good shape?
Any other differences worth considering?
Thanks,
Jim (digest mode)
2TS81417L+O

Check out the new British Cars Forum:
http://www.team.net/the-local/tiki-view_forum.php?forumId=8




<Prev in Thread] Current Thread [Next in Thread>