out to?

B18a/b
b20

 

b16a/b/b17a/b18a/b/c all go to 82mm on stock sleeves
b20b/z i wouldnt take past 85

 

What about if you have Golden eagle sleeves

 

the most for stock sleeves is about 1mm over...that really pushing it though.....For what ever reason B20 sleeves are the weekest I've ever seen........even w/ stock bore they just dont hold up......

With GE sleeves you can go up to 86mm...Thats the most a B'series motor can take.....I think anything bigger, you wouldn't have any valve clearence.......

Nick

 

Even though some people argue that the siamese bore helps strengthen the sleeves, I would still think that would limit flex each cylinder could have w/o affecting the others and lead to cracking. But of course higher RPM and raised compression might have something to do with that too....But thats just my opinion.... I could be completely wrong.

 

First, the B20 is probably the strongest stock block out of all the B-Series, it has a bigger bore, but it isn't just a bored out B18B, the walls are hefty, and I believe (but don't swear by it) that the walls are impregnated with something, like a fiber or something, to give it strength.

Now bore size has nothing to do with this, even if the piston was 20ft wide, if it was dished it wouldn't even come close to touching the valves. The only problem a bigger bore has (other than thin walls, especially at the siamese) is that it takes longer for the flame front to travel across it, so it's not as good at high rpm....say a 85mm compared to a 81mm at 9500 RPM

 

Then how come F-1 engines all have over 90mm bores and rev to 18000 rpms? Come to think of it how does a 105mm bore Winston Cup motor rev to 9500 ?

 

i would guess they have lightweight internal components to suppose the high RPM.

 

I just sent out my block to Golden eagle to get sleeved and decked out. I am about to get the 95m crank and also the custom rods. But whats a good size piston I should go with. I have a ls block and a gsr head thats fully built. My turbo is big like ****.

 

Nope. B18C is the strongest.

 

Maybe where just the only ones who know this.......

Nick

 

b20 is the strongest!

 

Stock Blocks:
"Nope. B18C is the strongest."
"b20 is the strongest!!"

All blocks are strong.
It just depends on the geometry of the internals youre going to run.
There are more stresses when you go less than 1.75 for rod/stroke ratio.

"Then how come F-1 engines all have over 90mm bores and rev to 18000 rpms? Come to think of it how does a 105mm bore Winston Cup motor rev to 9500 ?"

F1 is short stroked (design to spin!) with large bore.
Nascar stole Speedvision

 

Right on DonF.

It's easier to fit more or bigger valves if the bore is bigger. That's one of the big limitations with the small bore D series.

 

The design of the sleeves of the B18C are different than other honda blocks.
The sleeves are designed in such a fashion which prevents them from moving
around. This cannot be said of a b20 when in fact many B20s have the problem
of the sleeves SHIFTING. Also the B18C has much more support webbing than
other b blocks.

 

that explains why B20 Sleeves DON'T HOLD UP.....

 

I believe if the b20 r/s ratio was as good as the b18c
It would be just as strong (along with bigger bore).


[Modified by Quick 200k Mile Motor, 5:49 PM 9/8/2002]

 

Word.
Even if the B20 did have a what .03? R/S ratio improvement to match the b18c it still would be missing the added extras the B18c has. Block girdle, individual sleeves, and what SgT said. Etc.


[Modified by ill phil, 11:17 PM 9/8/2002]

 

if you put a blockguard on the B20, will it help out with the sleeve issue?

 

Heres a B18C Block


Heres a B20B block


How is that any different?

If you look between the liner and the block (the coolant passage) the has slightly less room, which means the walls are at least offset to make up for the bore increase.


[Modified by Westrock2000, 8:21 PM 9/8/2002]

 

First off- those are some beautiful looking blocks I wish mine looked like either -
But as far as differences
B18c top pic- if you look around the piston you will see that the sleeve isa complete circle around the cylinder wall and not conjoined as it is in the 2nd B20 pic. Thats the main difference I would point out in this picture. Hope this helped-

 

A dart block is the strongest lol. I was so close on ordering one but then they are banned in all events so far. So i went with a GE sleeving. SO now GE sleeved blocks are the strongest.

 

so i ask how do you re-sleeve a B20?

( )

t..