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Post by djm16 on Nov 28, 2021 11:33:53 GMT
This is primarily a question for Phil, but anyone else feel free to chime in too.
1) is the 3 litre (Mk IIb) head gasket the same as the 110 head gasket? It is just that they seem to have different part numbers even though I thought they shared a common block.
So 110 head gasket is 531803 and the 3 litre gasket is 547820.
2) head gaskets for the P3 75 are now quite rare and correspondingly expensive, the part number is the same for the P4 75 at: 212324 (copper, laminated).
The difficulty with my P3 is that a PO has fitted high compression pistons, and successive head shaves have resulted in pinging even on higher octance petrol. So I would like to fit two head gaskets to relieve this somewhat.
As the pressed steel gasket for the P4 75 263523 is less rare, and symmetrical, I might fit two of these back to back. Is that going to work do we think?
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Post by Phil Nottingham on Nov 28, 2021 12:13:10 GMT
The heads were changed slightly to ensure oil drained properly on the Mk2c engines which may (suffix B engine numbers) This was Feb/Mar 1964 for 110s and P5s. Neither heads nor gaskets are interchangeable between the old A and new B engines, The difference may only be an extra hole for the oil drain?
I would not expect 2 pressed steel head gaskets to be successful
The heads are flat so shaving them should not have made any difference to the compression but thicker gaskets will of course
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Post by djm16 on Nov 28, 2021 12:28:00 GMT
That was a quick reply, thanks.
re the P3:
Good point about the flat head. Perhaps because I used a pressed steel gasket instead of the usual laminated copper has made a difference?
re the 3 litre:
I have pictures of the 3 litre head gasket on Wadhams alongside the 95/100/110 head gasket from Wearings side by by side and can see no difference between them, no obvious extra drain holes.
Somewhat off the point a little bit, a few years ago I had a 95 I did some head work on and when the engine got hot enough, one of the pistons used to make contact with the cylinder head.
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Post by Phil Nottingham on Nov 28, 2021 12:32:52 GMT
Whose pictures are these?
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Post by djm16 on Nov 28, 2021 12:54:46 GMT
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Post by Phil Nottingham on Nov 28, 2021 16:10:02 GMT
Sometimes catalogues do not include the exact photograph. I will check my P5 parts list tomorrow but I do not have a P4 list that includes the 110 |
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Post by djm16 on Nov 29, 2021 0:36:21 GMT
Thanks.
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Post by enigmas on Nov 29, 2021 2:55:10 GMT
Why not source some thick copper sheet (if available) and make a gasket. Copper has been used for head gaskets for decades. My 42 WLA SV Harley Davidson still uses copper head gaskets. They can even be reused when annealed.
If you drew up a template you could even have it cut with CNC waterjet. Perhaps even sell a few. 😎 👍
PS. I Wouldn't advise stacking 2 head gaskets...they're not designed for that type of application.
If you know the CCs of the standard combustion chamber you could probably do some light relieving and also improve flow in and put of the cyl head, whilst correcting the volumes.
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Post by Phil Nottingham on Nov 29, 2021 15:48:55 GMT
Per my parts list P5s Mk1 to Mk2 (A & B suffix engines) 542351
Mk2c (C suffix engines) 547319
Although the P4 110 had the Westlake head with and without the oil drain these gaskets will have smaller cylinder cut outs to suit the 2.6L capacity.
The important thing is that if it is a C engine with big crank and modified head/block for the oil drain the later gasket must be used with the hole in it. I suppose but I have not tried the later gasket will fit all Westlake head P5s but not Westlake head P4s?
Hope this helps but it may be that later gaskets were a compromise to fit all Westlake 3 Litre heads?
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