Bill,
The TR4A '4into2into1' exhaust manifold and twin down pipe can fit TR3's -
but - you need to use a different 'Y' and 'connector pipe' at the twin
downpipes rather than the standard TR4A 'Y pipe'. The two special pieces are
available from Moss and others for about $75. The special 'Y collector' and
'connector pipe' comes in two seperate pieces instead of the 'one piece' TR4A
version to allow some jiggling to fit the piping through the narrower non-IRS
type frame.
I've read the 4A exhaust manifold enabled easier revving and an extra 4
horsepower at the top end of the range - but - you also need the late TR4
'gas-flowed' intake manifold (fitted mid-production TR4s and later), the TR4A
cam, and the 4A spec'd distributor to get those four horses.
Carl
'63 TR4 since '74 giddiapp
A friend gave me a TR4A 2 into 2 exhaust manifold (vice the TR3A 4 into
1). He claims that I'll get a 5 horsepower gain out of it. He also gave me
the 2 into 1 downpipe.
Originality police aside, does it really give you a horsepower gain?
Is there any conflict using it with a TR3A intake manifold?
Does it fit okay in a TR3 engine bay?
Does anyone else use one on their sidescreen TR?
And no, if I don't use it I am not going to sell it on Ebay. I will
give it back to my friend.
Bill Brewer
Tehachapi, California
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