Hello all, in an attempt to squeeze more "power" out of my 2.25L in my 1966 LR series 2a I was thinking of installing an 8.1 cylinder head. However I should first make sure I don't have one already. Can anyone tell which one I have from the picture?//uploads.tapatalk-cdn.com/2016073 ... c999e4.jpg
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Help identifying head
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Turton
- Little Wheel
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- Location: Kelowna,BC
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s3landy
- Apprentice
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- Joined: Sun Sep 19, 2004 5:09 am
- Location: Canada
Re: Help identifying head
Sometimes they are stamped on top. It is a newer head as the older ones had a deeper thermostat housing. Why not just skim the head you have?
Mike
Mike
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Turton
- Little Wheel
- Posts: 89
- Joined: Fri Sep 18, 2015 8:50 pm
- Location: Kelowna,BC
Re: Help identifying head
I was think of shaving it down, just want to make sure I don't already have an 8.1 already.
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S3ute
- Beyond Recovery
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- Location: Brisbane, Queensland
Re: Help identifying head
Hello from Brisbane.
Probably a bit late for a response, but in case not the answer to your original question is as follows:
DETERMINING COMPRESSION RATIO OF A 2.25L PETROL LAND ROVER ENGINE:
There are multiple head castings used on the 2.25L engine over the years. The two standard compression ratios used by Rover were 7:1 and 8:1.
The easiest way to determine a head's compression ratio is to look at the top surface between the valve cover and the carburettor. You will see a head bolt located there. On some heads there is a flat rectangular boss under the head bolt that extends towards the carburettor to the edge of the head.
If the head does not have this boss it is an early 7:1 compression head. If the head has the boss it is a later casting that came in both 7:1 and 8:1 versions, depending upon the country that the car was originally sold in.
If the boss has no stamping on the top or a big 7 it is a 7:1 head and was probably originally sold outside the United States. If the head has a large 8 stamped on the top (this could look like two '0's) then it is an 8:1 head.
I believe that skimming an 8:1 head thinking that it might be 7:1 can create problems when it comes to refitting it.
Cheers,
Neil
Probably a bit late for a response, but in case not the answer to your original question is as follows:
DETERMINING COMPRESSION RATIO OF A 2.25L PETROL LAND ROVER ENGINE:
There are multiple head castings used on the 2.25L engine over the years. The two standard compression ratios used by Rover were 7:1 and 8:1.
The easiest way to determine a head's compression ratio is to look at the top surface between the valve cover and the carburettor. You will see a head bolt located there. On some heads there is a flat rectangular boss under the head bolt that extends towards the carburettor to the edge of the head.
If the head does not have this boss it is an early 7:1 compression head. If the head has the boss it is a later casting that came in both 7:1 and 8:1 versions, depending upon the country that the car was originally sold in.
If the boss has no stamping on the top or a big 7 it is a 7:1 head and was probably originally sold outside the United States. If the head has a large 8 stamped on the top (this could look like two '0's) then it is an 8:1 head.
I believe that skimming an 8:1 head thinking that it might be 7:1 can create problems when it comes to refitting it.
Cheers,
Neil