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Jason Moyle Racing
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Return to: ENGINES
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#Post#: 1944--------------------------------------------------
Cooling problem of a different kind....
By: Tristan Date: July 30, 2014, 4:40 pm
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Opinions and advice sought folks. Dad uses a Fiat 131 Abarth
for historic rallying , 2.0 16v , twin downdraught IDFs , Guy
Croft rebuilt motor about 200 bhp . All has been running fine
til the other week , in Rallye Eifel in Germany . When queuing
for the start , or similar , it started running bad , and
spluttering etc .. took ages to get going right , had to be left
cool. A new coil was tried , no difference . Water and oil temps
were as normal , water around 80 degrees. Anyways , long story
shortened , when trying to figure it out , Dad noticed the inlet
mani was bloody hot , too hot to leave his hand on . We're
thinking the fuel wa boiling? He removed the ITG foamie air
filter , and just wrapped a bit of mesh around the trumpets and
that helped .
The car hasn't had any changes in the last few years , and has
ran in the same spec in hotter ambient temps , with no problems
. Fuel is 98-100 German pump fuel , which is what the car is set
up for .
Any ideas folks ? And any ideas how to fix it?
#Post#: 1945--------------------------------------------------
Re: Cooling problem of a different kind....
By: RobT Date: July 31, 2014, 12:48 am
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Sounds feasible. I would try and heat insulate the inlet with a
phenolic gasket for head mateing surface, and maybe ceramic coat
it? Cam coat in Warrington can help if u tell them issue. Try
cool it down.
#Post#: 1946--------------------------------------------------
Re: Cooling problem of a different kind....
By: mitlom Date: July 31, 2014, 7:54 am
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Have you asked Guy for his suggestions out of interest?
#Post#: 1947--------------------------------------------------
Re: Cooling problem of a different kind....
By: Tristan Date: July 31, 2014, 4:19 pm
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@tim , yes , we did indeed . He didn't think the phenolic gasket
would do a lot , strange IMo , I thought they were a good idea.
I suppose what's annoying is that it hasn't happened before , in
hotter conditions! Could the fuel be boiling lower than before?
possibly due to some additives for emissions or E5 or whatever?
@Rob , I suggested the likes of CamCoat , but on the exh mani ,
to reduce the underbonnet temps . How much difference did you
notice when you tried it first?
There's a powder coater locally that does a "chrome" effect PC ,
I was thinking that on the inlet mani might help reflect away
heat .
Dad is thinking of a duct out to the grille , too.
#Post#: 1948--------------------------------------------------
Re: Cooling problem of a different kind....
By: mitlom Date: August 1, 2014, 6:25 am
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[quote author=Tristan link=topic=229.msg1947#msg1947
date=1406841545]
@tim , yes , we did indeed . He didn't think the phenolic gasket
would do a lot , strange IMo , I thought they were a good
idea.[/quote]
LOL now that sounds about right for Guy...if he hasn't tried it
or recommended it then it isn't right ::) Guy and I have a bit
of history....probably best you never mention my name lol
Back to the topic in hand.....the phenolic gasket is definitely
not a bad thing IMO although if the cause of the issue is not
heat tranferal from the cylinder head then it'll make no
significant difference.
I would initially go back to basics as this is a condition that
has suddenly occurred......if still running a dizzy check ign
timing as from recollection the dizzy can work loose and a
change in timing (retarded) would certainly cause the symptoms
described.
Has anything else been changed before the event? Plugs for
example? Typically Guy use to spec plugs one grade cooler on
his high output engines, using a std grade plug if you have a
concern with fuel would also cause some problems in higher
ambients.
I have personally never been a huge fan of foam type air filter
elements and I know for a fact that Jason isn't either!
Wish I could be of more assistance.
Tim
#Post#: 1949--------------------------------------------------
Re: Cooling problem of a different kind....
By: Tristan Date: August 1, 2014, 3:57 pm
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Yeah..Guy is.....somewhat thorny on occasion! lol! I like him ,
having been in the workshop , but on occasion would be fit to
choke him haha.
#Post#: 1950--------------------------------------------------
Re: Cooling problem of a different kind....
By: Tristan Date: August 1, 2014, 4:08 pm
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because we all like pics...
[URL=
http://s22.photobucket.com/user/RedLexus/media/131Eifel2014_zpse55e1793.jpg.htm…
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