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Join Date: Nov 2005
Location: brampton, ontario
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heat exchangers

Hi, can someone help here. I just purchased used heat exchangers from a fellow pelicanite. I have a 1977 3 lt. turbo engine. The heat exchangers that are on there are missing the heat coverings over them, they are the ones with the thick flange. The ones I purschesed are with the thin flange.

ok here is the problem. After installing one side with the thin flange and hooking up the exhaust system then starting the engine, at 1000 rpm there is a "clacking" sound that is coming from the muffler. When I rev the engine pass 1000 rpm the clacking sound goes away. There is no exhaust leak anywhere.

Would this thin flange be causing this sound and is there any chance of hurting my engine.


I would appreciate some response.


Thanks

Tas911
Old 08-15-2007, 06:58 AM
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can anyone help with this?'''


tas911
Old 08-16-2007, 07:59 AM
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Crotchety Old Bastard
 
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If the clacking is not due to an exhaust leak I don't know what it could be. Do you think the header flange extends far enough into the exhaust port that it interfers?
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 08-16-2007, 09:12 AM
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Rarlyl8 thanks for the reply. The clacking seems to be coming from inside the muffler. It's got me baffled! do you think that it could be a leak inside the heat exchanger.....hmm?

anyway of checking that?
Tas911
Old 08-16-2007, 12:13 PM
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Crotchety Old Bastard
 
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Turn the heat flaps on in the car and see if you smell exhaust.
If something in the muffler is loose you can remove the muffler and shake it.
Ultimately you can just put the old H/E back on and see if the noise goes away.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 08-16-2007, 01:18 PM
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Thanks, I'll try that. Just to be clear, I have a straight-thru cherry bomb exhaust coming out of the turbo.


Tas911
Old 08-16-2007, 01:26 PM
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