Hi all,
have a question,
How can you tell a high compression head from a low compression one?
The engine is a 202 red motor engine prefix QL.
Cheers
Chris.
How to tell a High comp from Low Comp
Started by
_big chris_
, Mar 16 2006 10:23 PM
5 replies to this topic
#2
Bazza
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ǝɹnʇxıɟ ɯnɹoɟ
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Posted 16 March 2006 - 10:49 PM
Hi
The part number on the head will give a clue. It may not be the correct head that goes with that motor.
Bazza
The part number on the head will give a clue. It may not be the correct head that goes with that motor.
Bazza
#3
FastEHHolden
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Steptoe
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Posted 17 March 2006 - 03:58 AM
If you look at the numbers on the head you can see a H or an L to the back of the head...that doesn't mean that the head hasn't been played with at sometime in the last 35 yrs.
#4
_73LJWhiteSL_
_73LJWhiteSL_
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Posted 17 March 2006 - 01:16 PM
I thought there was different engine numbers for high comp and low comp.
From memory High comp 173 from LJ is CD and low comp 173 is CB
Also High comp 202 from LJ is JL and low come 202 is JM
Steve
***EDIT*** missed that he asked about heads, not engines
From memory High comp 173 from LJ is CD and low comp 173 is CB
Also High comp 202 from LJ is JL and low come 202 is JM
Steve
***EDIT*** missed that he asked about heads, not engines
Edited by 73LJWhiteSL, 17 March 2006 - 01:20 PM.
#5
mrlctorana
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Posted 17 March 2006 - 01:20 PM
if the head is off you can tell by looking at the combustion chamber, a low compression head will have a larger combustion chamber, On a high compression head the combution chamber will be very close to the vavles, or a kidney shape.
I think, not sure without going for a look but on the manifold side of the head at the back the will be the letter L (low) or H (high)....
Cheers
Les
I think, not sure without going for a look but on the manifold side of the head at the back the will be the letter L (low) or H (high)....
Cheers
Les
Edited by mrlctorana, 17 March 2006 - 01:22 PM.
#6
_big chris_
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Posted 17 March 2006 - 05:25 PM
Hi all,
thanks for the replies,
There are several set of letters on the head,
There is a seperate one at the back of the head,
there is an "8" then near that and "L".
So I guess is low compression.
Cheers
Chris.
thanks for the replies,
There are several set of letters on the head,
There is a seperate one at the back of the head,
there is an "8" then near that and "L".
So I guess is low compression.
Cheers
Chris.
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