Clearance

mharney · Post by **mharney** » Sat Aug 24, 2002 9:53 pm

I'm mocking up my 2332 build, and have noticed that there is some interference between the crank and my 86b cam lobes.

When I grind the crank, how much clearance do I want between the parts to be safe?

It's already been clearanced, but it does not clear this cam, so it needs a little more. I'm guessing a few thousandths in a couple spots will do it.

I suppose it is a good idea for me to have the crank rebalanced. I know that rods and pistons are quite critical, but I have no sense of what is the deciding factor for the crank.

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James2 · Post by **James2** » Sat Aug 24, 2002 10:19 pm

no, no no. stop! don't grind the crank, grind the cam.

mharney · Post by **mharney** » Sun Aug 25, 2002 7:46 am

Whoops...

Just kidding.

No it's not the shaft.. the cam has already been clearanced for stroker, its the actual lobe of the cam and the crank.

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[This message has been edited by mharney (edited 08-25-2002).]

vdubsinjensen · Post by **vdubsinjensen** » Sun Aug 25, 2002 8:22 am

Mharney,what brand of crank are you using?The reason I ask,is because I'm about to start assembling a 2332 also with the same cam.I'm hoping I don't have the same problem.Paul www.jbbugs.com

Marty · Post by **Marty** » Sun Aug 25, 2002 8:58 am

<BLOCKQUOTE>quote:<HR>Originally posted by mharney:
Whoops...

Just kidding.

No it's not the shaft.. the cam has already been clearanced for stroker, its the actual lobe of the cam and the crank.

<HR></BLOCKQUOTE>

WOW! are you sure you have the cam timed right? Also you better chec rod cap to cam clearance again.

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Marty Staggs
www.staggsracing.com

James2 · Post by **James2** » Sun Aug 25, 2002 9:00 am

hmmm, sorry, your over my head now. which not hard to do.

Sure the cam gear and all is on correctly?

What cam is that?

mharney · Post by **mharney** » Sun Aug 25, 2002 9:17 am

<BLOCKQUOTE>quote:<HR>Originally posted by vdubsinjensen:
Mharney,what brand of crank are you using?The reason I ask,is because I'm about to start assembling a 2332 also with the same cam.I'm hoping I don't have the same problem.Paul www.jbbugs.com <HR></BLOCKQUOTE>

This crank is not available anymore. It's an older BPP crank with 912 rod journals.

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[This message has been edited by mharney (edited 08-25-2002).]

mharney · Post by **mharney** » Sun Aug 25, 2002 9:22 am

I think it is correct. I positioned the gear in the same orientation that it was on a working 110 cam which also interfered btw.

What's the correct way to be sure the cam and gear are oriented correctly? I put it back on the way it came off the other or so I thought.

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JohnConnolly · Post by **JohnConnolly** » Sun Aug 25, 2002 9:36 am

make sure the oil pump slot aims at the cam bolt, it can only go on one way.

John
Aircooled.Net Inc.

mharney · Post by **mharney** » Sun Aug 25, 2002 9:51 am

If you mean that the slot lines up with the dot on the gear, yes.

It may be hard to see, but the dot is at the top. It is aligned with the crank properly too.

Thanks!

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[This message has been edited by mharney (edited 08-25-2002).]

mharney · Post by **mharney** » Sun Aug 25, 2002 10:01 am

The shadow on that pic makes it look a lot more than it really is I guess. I would guess that about 0.004" interference, maybe. It's hard to get a good pic with the flash. I will try some foreground lighting to see if it can be shown better.

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MASSIVE TYPE IV · Post by **MASSIVE TYPE IV** » Sun Aug 25, 2002 10:07 am

I have had this problem before....Yoyu are in for a round with a reduced base circle..

Those ramps look awful fast to be an 86B, but maybe the pic is messing with me.

My 200+HP 2332 uses the same lift as an 86C which is .010 more than an 86B and cleared with .018, she has seen 8K so far and stayed together...

If you think thats alot of clearance work and hassle, try building a 90 stroke TIV engine, or for that matter even an 8o stroke.

Mark, check your mail, I sent you some info on how to get the correct cam with the correct base circle from web the easy way..all you need is an old stock cam and a grinder.

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Jake Raby
Raby's Aircooled Technology
www.aircooledtechnology.com

mharney · Post by **mharney** » Sun Aug 25, 2002 10:15 am

Aaaargh.

No, no, not a huge hassle.. just another thing to fix. I just bought it clearanced hoping to fit.

Hope in one hand...

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JohnConnolly · Post by **JohnConnolly** » Sun Aug 25, 2002 10:58 am

it does fit with almost all other cranks, you are in need of a reduced base circle cam to get the clearance you need.

John
Aircooled.Net Inc.

Post by **Tom Notch** » Sun Aug 25, 2002 12:40 pm

Here's a pic of my Berg 84mm crank. See the clearance cut in the outer radius of the cheek? This clears an 86C with about .o30" to spare (not sure of the numbers, been several years since I 1st put it together). It's not a reduced base circle cam, that would be my last choice of druther's. This is a Capri/Porsche journal for reference (54mm).
http://home.att.net/~airdoc/t1engpix/Image000.jpg

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Tom's Old VW Home