tybrown
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Cosworth head part number.
I am just doing some research of my own on the cosworth cylinder heads.
recently its been brought to my attention that there are 4 differnet types of 2wd cylinder head.
I was wondering out of the guys on the forum with a 2wd head and three bolt thermo housing what is the YN0*** part number on the front of the head. and do you have coscast between the cam gear?
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Luke
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RE: Cosworth head part number.
2008/10/31 19:10:39
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This is something Im interested in myself my head is supposedly from a saphire its got the 3 bolt housing but no coscast and the part number is yn0 450. The 4 you know of are they
RS5000
2 bolt thermo
3 bolt thermo
3 bolt thermo with coscast
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tybrown
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RE: Cosworth head part number.
2008/10/31 19:25:28
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im talking about 4 differnet 2wd heads that have the 3 thermo bolts! (i forgot to mention that in the first post)
im still working out whether your part number is an early sapph head or a later? i know that the yn0925 yno935 is a later head.
i was told there are slight differences between certain heads.
its nothing to worry about. its just interesting as to why the changes where made and when etc... im not sure if it effects power output???
i wasn't aware of the yno450!!! interesting though. i will try and find out more.
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Luke
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RE: Cosworth head part number.
2008/10/31 20:27:27
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Far out be interesting to see how many there are
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tybrown
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RE: Cosworth head part number.
2008/01/11 12:31:16
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ok some more information
the rs500 (have checked this out on my car also) uses a YNO627 3 bolt thermo and no coscast.
apparently there were a few crate engines (spare rs500 engines made for the race cars or just spare engines) they have the part no. YNo627 with coscast
then you have the early sapph head (this could be the head you have santa???) still got to work this one out. YN0450
and the later heads YNO925 YNO935... I THINK??
also some heads have the coscast some dont? not sure why????
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tybrown
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RE: Cosworth head part number.
2008/01/11 12:35:26
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Santa does your head have 4 bolt holes at the back of the head or only 2???
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Luke
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RE: Cosworth head part number.
2008/01/11 14:42:13
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Its a bit hard to see in the car but I can only see 2 bolts up top and this would mean what?
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LINCOLN
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RE: Cosworth head part number.
2008/01/11 14:55:12
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Will check the two I have got and mates two original rs500 ones.
Check the profile of the water ways on the exhaust side you have. Are they holes or slits?
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LINCOLN
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RE: Cosworth head part number.
2008/01/11 14:59:59
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Found this quote from the rsm site talking about 2wd cyl heads.
"To my knowledge everything from the V89HF casting on has the closed in exhaust side water jackets. So Sapphier on I think. This version on also has the more hemispherical combustion chamber with slightly smaller CC volume. Only the V86HF part number casting got the open water jackets."
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Luke
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RE: Cosworth head part number.
2008/01/11 15:32:58
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Mine is V86HF with holes. So that means its a early head correct?
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LINCOLN
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RE: Cosworth head part number.
2008/01/11 16:49:06
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Holes on the exhaust is later head - better to support head gasket.
I have seen with my own eyes.
RS500 = no coscast, slits on exhaust side.
?? = coscast, slits.
?? = coscast, holes like later 4wd heads.
Not sure on numbers though.
Will check.
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LINCOLN
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RE: Cosworth head part number.
2008/01/11 17:07:58
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I don't think the numbers mean much.
Mate has seen identical numbers (86) with and without slits on exhaust side.
Maybe 89 is 4wd head but I have never taken notice.
Numbers does not seems to tell whether you have the closed in water jackets.
However all three bolt head housing have the larger head bolt surface I have seen.
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LINCOLN
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RE: Cosworth head part number.
2008/01/11 17:09:29
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Oops will check the yn numbers....
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tybrown
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RE: Cosworth head part number.
2008/01/11 20:11:30
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Lincoln the YN number tells all!!!
i just found out about all this.
your friends rs500 should have yn0627 no cos cast.
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Phil
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RE: Cosworth head part number.
2008/03/11 08:46:12
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My EECIV head has YN1043 and Coscast on it  I also have a 2wd Saff head which I will check and get back to you.
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