Case Clearancing For 84 Mm Crank

[neil68]

Alan, or any others running 2332 cc type 1's:

In your current engine, are you using a crankshaft with VW journals or chevy size?

I'm looking at increasing my displacement to 2332, but would prefer to re-use my current 5.5\" H-beam rods (to stay within a reasonable budget).  However, these rods have VW-sized journals, which would probably require some extra clearancing inside the case...I'm currently using a recent Brazilian mag case (three years old).

Thanks!

Neil  

[Bruce]

Neil, Alan is using a Chev journal crank.
VW journals can be made to work, but it gets very very close.  What rod bolts do your rods have, 5/16\" or 3/8\"?  Who's rods are they?

[neil68]

Hi Bruce,

I currently have CB Performance H-beams with 5/16\" ARP 2000 bolts (didn't feel the need for 3/8\" bolts with my current 2017 motor and only 131 HP at the wheels).

I may go with either 2175 or 2276 displacement for winter motor upgrade, if the 84 crank is not in the cards...

Thanks,

Neil.

[dannyboy]

my 2276 has vw journals, and it got quite thin in the roof of the case, i would imagine that an 84 would be really close. imho i think the best thing to do is save up a bit more and buy an 84 with chev journals and get some scat h-beams to match...

[Bruce]

The rods you have may work with an 84 stroke VW journal crank.  If you had 3/8\" bolts, they would not fit.  I know that 5/16\" rod bolts in Eagle rods on an 84 stroke VW journal crank can be made to fit.  Whether the CB rods are the same as Eagle is unknown to me.

[dannyboy]

btw, my 2275 has the 3/8 bolts

[josh]

2332cc scat H beam 3/8\" bolts, 84mm DMS welded crank with chev (actually buick) rod journals. My case was done by rimco, I honestly didn't look at how close (thin) the clearancing was.

If your case is on it's last legs you could always go to a cb \"raised roof\" alum case to gain some room.

[neil68]

Josh,

That's my dilemma.  My mag case is only three years old, with fairly low mileage, tight lifter bores, standard mains, bluerprinted matching oil pump, the whole package is there and I could use slip-in 94's (90.5 case bore).

However, I can also get a raised-roof aluminum case for $600 CDN that's already cut for 94's and then pretty much drop in an 84 crank.

Thanks for the suggestions...

Neil.

[neil68]

Thanks for the input.  I placed my order today with Concept 1 for an 84 mm crankshaft with chevy journals and 5.5\" rods, so I'll go with a 2332 cc for next season.

It looks like the amount of clearancing that I've already done on the case for the current 78.4 x VW journal rods, will only require a bit more work to make the 84 x Chevy journal rods fit.

Also toying with replacing the current FK8 with an FK 10...

[dannyboy]

but the k-8 is such a wicked cam!

[jim martin]

sell your rods, regrind to a chevy rod journal ,get it wedgematted at the same time,buy new rods.done

[Darren]

I tried a K10 over a K8 a few years ago on a 2275 with no other changes and if I were you I would stick with the K8

Chow,

[red snapper]

I tried a K10 over a K8 a few years ago on a 2275 with no other changes and if I were you I would stick with the K8

Chow,

Speaking of case machining ........................................................













   

[josh]

I tried a K10 over a K8 a few years ago on a 2275 with no other changes and if I were you I would stick with the K8

Chow,

but he's going up in displacement from a 2017 to 2332 so would that benifit from more cam? not that i'm questioning a real engine builder.........just wondering B)  

[neil68]

We have one or two more Friday-night street legal races here in Calgary and then I'm going to send my heads and manifolds to K-roc for some work.  The heads are \"out-of-the-box\" CB 044 CNC oval-ports and the manifolds probably need some porting as well.

I will stay with the FK8 for now and then perhaps experiment with other cams later, if necessary.  The FK8 is so nice for street driving, so that is certainly a plus