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Old 07-11-2012, 12:51 PM   #1
Padmei OP
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1000cc barrels

Hi All.
I've acquired some 1000cc barrels & pistons with a bore of 97.09mm & 97.07mm. I believe they have a B on the bottom of the barrel but not 100% sure of that - i will check later
Can anyone enlighten me what they are or the specs for them. The pistons look to be hi comp Mahle. I'd post pics but i'm back to dialup speed for a few days
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Old 07-11-2012, 03:44 PM   #2
bernardofeio
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most probably it's a BMW 97mm 9.5:1 or HPN 97mm kit.

did it come with conrods?
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Old 07-12-2012, 12:11 AM   #3
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Quote:
Originally Posted by bernardofeio View Post
most probably it's a BMW 97mm 9.5:1 or HPN 97mm kit.

did it come with conrods?
BMW never supplied anything larger than 94mm which is the 1000cc bore.
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Old 07-12-2012, 12:46 AM   #4
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Quote:
Originally Posted by bernardofeio View Post
most probably it's a BMW 97mm 9.5:1 or HPN 97mm kit.

did it come with conrods?
No just the pistons & barrels. I will post some pics in a few days & see what you think they are. Apparently the po of them went with a seibenrock 1070 kit instead of replacing rings on these ones.
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Old 07-12-2012, 02:16 AM   #5
igormortis
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Well, with the standard stroke, that will give you 1043cc all right. What do they look like shape-wise? Shorter and squat-er than your R65 pistons for example?
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Old 07-12-2012, 06:14 AM   #6
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Originally Posted by igormortis View Post
Shorter and squat-er than your R65 pistons for example?
The cylinders should also be shorter than standard by about a 1 cm. They'll require shorter pushrods, pushrod tubes, carb intake elbows, and cylinder studs. Not exactly a quick bolt-on affair.
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Old 07-13-2012, 11:51 PM   #7
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Here are the pistons & barrels I was talking about

They measure up at 97.07mm but I was after some more specs







The barrels look to me to be R80s bored out. Would I be correct with that?





Anyone have any more info that could help. Thanks
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Old 07-14-2012, 12:42 AM   #8
Rob Farmer
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Defo bored out 80 barrels.
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Old 07-14-2012, 01:04 AM   #9
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I had another look & inside the pistons is the manufacturers name Venolia. I have googled & they seem to make performance pistons for drag cars etc. I tink perhaps the previous owner did his own power upgrade. I will try to chase up some specs & rings from over here.

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Old 07-14-2012, 01:59 AM   #10
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There were a lot of problems with the venolia pistons cracking, and the ring seal is poor when the engine is hot due to the thin wall iron liners, I would sell them on now to sombody that knows nothing about them. I have 3 coustomers that all have one piston each and a lot of scrap on the other side .
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Old 07-14-2012, 02:59 AM   #11
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Whew, that was close, I was going to suggest you send them up to Auckland ....
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Old 07-14-2012, 04:27 AM   #12
igormortis
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Whew, that was close, I was going to suggest you send them up to Auckland ....
Come on now, you only need to last what, a few laps? Give him what he paid for them and think of them as a consumable!

What combustion chamber are these designed for? The 80 or 100? I haven’t looked at enough heads to know the difference.
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Old 07-14-2012, 05:16 AM   #13
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These are indeed R80 cylinders. They have had a sleeve installed to accept the big-bore Venolias. Luftmeister and CC Products/San Jose BMW sold kits like this in the USA and I suppose exported some. The problem I've seen withe their kits is that whovever did the boring and honing couldn't seem to get the clearances right-they were always too big, and there is no fix for excessive clearance except a bigger piston or re-sleeving.

The domes on those pistons are quite tall for the bore size. You'd have to have access to some good gas to make 'em work.
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Old 07-14-2012, 11:17 PM   #14
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Originally Posted by moorespeed View Post
There were a lot of problems with the venolia pistons cracking, and the ring seal is poor when the engine is hot due to the thin wall iron liners, I would sell them on now to sombody that knows nothing about them. I have 3 coustomers that all have one piston each and a lot of scrap on the other side .

Bugger - you could have PMed me that so I could have sold them off for a fortune to some North island Airheads - they have way more money & less brains up there.

Oh well I wonder if they'll make good lampstands???

Thanks all for your help.
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Old 07-14-2012, 11:37 PM   #15
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Quote:
Originally Posted by moorespeed View Post
There were a lot of problems with the venolia pistons cracking, and the ring seal is poor when the engine is hot due to the thin wall iron liners, I would sell them on now to sombody that knows nothing about them. I have 3 coustomers that all have one piston each and a lot of scrap on the other side .
Actually Venolia's are great pistons. They are used to be very popular with racers. I had a set in my R90. They are made of a very tough aluminum alloy that has a different expansion rate than stock BMW. They tend to rattle when COLD and seal up nicely when HOT. The problem is making sure you have the proper bore to work with them. Check with Venolia to make sure. As far as the liners being too thin, I can't say.
Those have a pretty serious dome on them, could be pretty high compression.
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