Noise when revved

#1
Hi there,
Any wisdom welcome.
I have a 2200sc, it’s running lovely, power across the Rev band and pulls like a train. But for a while now it does a high pitched rattle noise when revved hard and quickly, both on the acceleration and sometimes on the de acceleration of the engine. Almost sounds like a vibrating heat shield or something. It only does it when driven hard and I’ve not noticed it while cruising.

It’s quite a high mileage engine 95k, but had a new head about 3k. Also has 160psi across all cylinders. (Not that that would make any difference of course)
Any insight would be appericated.
Cheers
Peter
 

harveyp6

Well-Known Member
#4
If you look at where the carb joins the manifold there is a black insulator about 5/8" thick, and there is a metal tube within that which aligns the insulator to the manifold. The tube breaks or comes adrift and causes a noise. Undo the 4 nuts holding the carb and move the carb out of the way and you should see if that is your problem.
 
#5
If you look at where the carb joins the manifold there is a black insulator about 5/8" thick, and there is a metal tube within that which aligns the insulator to the manifold. The tube breaks or comes adrift and causes a noise. Undo the 4 nuts holding the carb and move the carb out of the way and you should see if that is your problem.
Thanks Harvey I’ll take a look this weekend!
if it’s a drift. Any advice on fixing it back in place? Is it a job for araldite?
 

jp928

Active Member
#11
That insert would make a pretty light noise wouldnt it? Just in case its not that item, and a heavier noise ..... I saw once a 4cyl engine making strange noises that most observers could not fathom. With the cam cover off, nothing amiss was visible. With the sump off though the chain anti-slap guide (not sure of technical name) for the primary chain was loose and rattling up and down - the mounting 'ears' had both broken off where it bolted to the block.
 
#15
Hi Guys,
So I took the carb off and found the sleeve has already been removed. Must have been removed before I got the car (20 years ago).
But I have found the cause! The exhaust mounted on the down pipe has split in two! I wedge the down pipe with a bar and the rattle goes away.
At least it’s an easy fix.
F9D4BABD-CC2E-4077-ACB6-BEDE64A8510B.jpeg
Thanks for the help any who!
 

jp928

Active Member
#17
Occam's Razor - go for the simplest solution first. Or, given the choice between a conspiracy and a stuff up, go for the stuff up first.
 
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