Poignard
Well-Known Member
Please can anyone tell me the thickness of a new cylinder head gasket for a BUKH DV10? I'm going to make one and I need to make sure I order the right thickness of gasket material.
BUKH DV10 - thickness of head gasket
- Thread starter Poignard
- Start date
rotrax
Well-Known Member
The thickness required will be to achieve the correct compression ratio-21.5:1 from my recently aquired handbook-thank you Sugar Kane. A pre-compressed gasket-IE a used one-will be significantly different to a new one.
Measure the old one, add a few thou's-or fractions of a mm if you work in metric- and give it a go.
I have made many, many copper and aluminium head gaskets in my time, but not many for water cooled units.
I once got away with a home made head gasket on a Honda motocross bike-one of the early water cooled ones-by using an air cooled gasket of the correct bore size to seal the combustion chamber, adding a sheet of material around its outside-Hallite IIRC- punching holes with a hole punch and lead block in the right places for the water jacket holes and sealing with instant gasket.
It lasted the rest of the season without any trouble, even though the correct gasket became available and was kept in the spares box.
The trick here was knowing the compressed thickness of the air cooled gasket was slightly less than the Hallite-only a few thou. In use it sealed enough to keep the compression and water in the right places.
Your Bukh one might have to deal with keeping the oil in too......................................
Scotty_Tradewind
Well-Known Member
Hi Parsifal, why make on when the correct thing can be purchased for a few quid from just down the road at
http://www.bukh.co.uk/contact.html ?
rotrax
Well-Known Member
Well done Scotty-I assumed from the OP that it must be unobtainable or out of stock!
Poignard
Well-Known Member
A few quid! £56 for a gasket for a single cylinder engine. Are you made of money?
A piece of suitable material, enough for two gaskets, will cost ca. £11. An hour with a piercing saw and the job's done.
One day God will punish BUKH for the prices they charge!
VicS
Well-Known Member
A few quid! £56 for a gasket for a single cylinder engine. Are you made of money?
A piece of suitable material, enough for two gaskets, will cost ca. £11. An hour with a piercing saw and the job's done.
One day God will punish BUKH for the prices they charge!
Out of interest what do you consider to be "suitable material"?
Poignard
Well-Known Member
The same as is currently supplied by BUKH. Steel sandwiched between layers of fibrous material.
This sort of thing:
http://www.ebay.co.uk/itm/Cylinder-...hash=item2ed3f6c468:m:mSTWObVjIVo65l0P3S_HMzw
Scotty_Tradewind
Well-Known Member
Looks the part but, extremely clean edges to holes cut are required otherwise you maybe starting the 'passage' for another reason to change it.
S.
rotrax
Well-Known Member
I have never seen a genuine Bukh gasket but I suspect it will have a soft metal ring folded top and bottom around the bore hole.
Without this, a short life can be expected. Perhaps find another 85mm head gasket and carefully unpeel it and fit it to your home made one.
Good luck.................................
Without this, a short life can be expected. Perhaps find another 85mm head gasket and carefully unpeel it and fit it to your home made one.
Good luck.................................
Poignard
Well-Known Member
Looks the part but, extremely clean edges to holes cut are required otherwise you maybe starting the 'passage' for another reason to change it.
S.
Certainly. Hence the use of a piercing saw. A traditional tool with a fine toothed blade intended to cut (pierce) thin sheets of metal.
https://www.etsy.com/listing/150818687/antique-jewelers-saw-frame
Poignard
Well-Known Member
It's called a fire ring. That's how they used to be, but for some time now BUKH have used the sandwich material I mentioned above.
ghostlymoron
Well-Known Member
I considered doing this but after watching this video decided against it. https://youtu.be/KzzkYb6D22M
ghostlymoron
Well-Known Member
I notice that the material supplier will also make a head gasket.
Poignard
Well-Known Member
Poignard
Well-Known Member
Quick, ain't he? The state of the hole-punch head suggests he's done it a few times before!
Scotty_Tradewind
Well-Known Member
Combustion seal is what the second video I saw called it.Looks the part but, extremely clean edges to holes cut are required otherwise you maybe starting the 'passage' for another reason to change it.
S.
S.
rotrax
Well-Known Member
That makes the genuine gasket a steal...................................
Poignard
Well-Known Member
Maybe if I had a few hundred made the price would come down. :nonchalance:
Any BUKH DV10 owners interested?
Hadenough
Well-Known Member
Jeez that's clever!
RichardS
N/A
Beautiful work and so quick but that gasket seems to have a huge number of oil and water ways through it.
Richard