Anybody know? It's likely page 20 of the helms...

I'm trying to find bearings that will work for my F20B crank...I believe it's 55mm...

 

rod or main?
F20B should be the same as H22A

 

Not true. The F20B is a funny thing, it is not much like an H22a....the rod bore is small, 48mm like a B16, not 51mm like an H22a, yet it has 22mm wrist pins, like the H22a.

The main journals are huge compared to the H22a. H22a is 50mm, but I have this one at 55mm.

So the rod bearings are B16, and now I think the mains are B series as well.

 

Well, Im pretty sure that the b series has a 45mm rod journal diameter.
As for the mains, you know that the h22a changed the size of the mains after1998
right? I'll check the diam todaywhen i swing by the shop.

 

Really? I had people check helms from both those years and they all said 50mm....I heard that too but I think it's just misinformation.

http://www.crower.com/cat/import/honda/rods.shtml

From crower all b-series rod journals are 1.890" or 48mm

 

i have a 98 prelude crank sitting at my shop that uses larger mains than the older
cranks. so its fact, not misinformation.

for the rodsize, thats my fault,i was reading the eagle catalog, which says 1.772
but the box i have says 1.890.

im headin out there now, so i'll take some measurements and post later.

 

Really......I'm interested to see about this....thanks!

 

Okay, here it is. These are CRANK JOURNAL diameters, sorry didnt do width:

H22A1(93-96)/H22A4(97-98) - MAIN 50mm, ROD 48mm
H22A4(98.5+) - MAIN 55mm, ROD 48mm
B20A1 - MAIN 55mm, ROD 48mm
B16A/17/18/20b/z/etc - MAIN 55mm, ROD 45mm

Remember that crower lists big end bore at 48mm because thats without bearing
and we are talking about crank not rod here. When I quoted my earlier numbers
i was looking at the eagle CRANK, and then checking the box on the RODS which
is where the discrepency came from.

As i suspected, the F20B(being that it is in fact a destroked H22A) uses the same
bearing sizes as the H22A of the same year.

 

Awesome. Great Information. So given that we always work with H22A1 blocks for building, that's why we were confused about the mains.

Actually I'm still out on the rod journal issue, I just measured the rod itself, and I have about 48mm diamter of the rod and about 45mm inside the bearing...so that makes it like a b series right?

I have to do a line bore, so I'm think about boring the block out (it's an A1 block)to 55mm for the mains (well I suspect it's more like 59mm cause block + bearing + clearance) to fit thise **** in. Good idea/Bad Idea?


[Modified by satan_srv, 7:17 AM 2/10/2003]

 

you might have to redo the oil channels in the main saddles. but it sounds doable