E Swift

When I build my block in the next couple months, I was thinking about installing a B20 Bottom block with a B17A crank, aries pistons, and eagle turbo rods onto my LS head. Plus, my car is turbo, and I was curious if anybody has done this setup with this block? What kind of torque increase would that be? Plus, the block will also be resleeved as well.

93LSivic

Please enlighten me on your choice of crank. Would that even work with the b18/b20's stroke?
Also you should have the LS head taken to a machine shop and have the quench area enlarged to accomodate the larger bore for the block.


[Modified by 93LSivic, 2:58 PM 7/6/2002]

E Swift

The B20's crank's stroke ratio sucks. The B18B is okay to use, but, I was informed that the B17A would be the best possible choice. I'm not completely ruling out the possibility of using my original crank from my LS motor, but, I'm just looking at other possibilities.

I plan on having new valve springs and retainers installed into my head, but, I'm not familiar with what you're talking about. Can you enlighten me a little more on it? Thanks

Ri5e

I'm running a B20B block with a B18B head. 10.5 PSI Daily.

The_Head

the B18B and B20B/Z use the same crank... same stroke, different bores.

I have heard their are hardly any aftermarket rod choices for the B17A crank because they are so rare, and do you have a B17 crank already? They are very expensive...

Just something to think about..

<--------- is going with the B16A block, GE resleeve with a 84mm bore.
1707 cc's for more torque, and 9000+ RPM's with no worries.

boosted hybrid

I dont know if anyone has seen that eagle just released a stroker crank for the b18b engine making it a 2.0 liter. It makes the stroke 95mm, which means longer rods, which means better rod/piston ratio. I have gone on thinking that if you bought a LS short block, resleeved it and bored to 84.5mm you would have essentially a 2.2 liter. Drop a vtec head on it, add a block girdle and rev away. I would love to hear others thoughts on this, but i have already contacted eagle on the availability of the crank and new rods for the stroker project. Just imagine a reliable 2.2 liter b-series vtec! Neck snapping torque!

blufke

why use the ls head? arent the b20 and ls heads the same, just maybe diff. cams? i know the valves are the same size.

E Swift

Wouldn't it just be safer to resleeve a B20 block to a B22 block, instead of boring a B18B to a B20? Because with a B20 block, they've got thicker walls, whereas, boring a B18B to a B20 makes the walls of the cylinders pretty thin.

Eyewitness

Is it possible to destroke a b20 or maybe an h22 to make the b20 1.8 with a better ratio...or maybe the h22 to 2.0....i just know that the pikes peak tacoma uses a destroked 2.4 to 2.2 turbo and its sick....thought maybe the idea would work here???

mskibbz-T

A B17 crank will offer a much better r/s ratio than using a B18B crank...

1.8T_EG

... very interesting!!!... keep us posted on anymore info you find out...

mos

If you use a 95mm stroker crank on a stock height block, your r/s ratio will go to poop. More stroke means SHORTER rods, not longer ones... I was thinking about using a 95mm crank with a riser plate. That's really the only way to do it right, but it aint cheap. You'll need custom length rods too if you do this. You will have a 2.2 liter B-series engine, but you might not be able to safely rev it as high as a 2L.

I did all the $$/hp math and decided it was not worth it even though I already have a 95mm stroke crank out of a '91 prelude. Neck-snapping torque?... more like tire-spinning. Guys are making crazy amounts of power with 1.6 liters already so why go 2.2?? I guess it'd be cool if you wanted something different and had the cash though. Being 'special' costs extra, easier to go with a proven formula.

ed: Eyewitness- Yes, you can make a 1.8 liter Bseries motor with a bitchin r/s by using an 84mm bore and b16 crank....I'm sure some people on HT have done this. There's really no point in destroking an H22, I've read on other posts that the trannys don't like to shift at high RPM.


[Modified by mos, 10:28 AM 11/1/2002]

DIRep972

iTrader: (1)

correct. if u use the 95mm crank you will need custom rods and a deck plate added on to the block in order to maintain a good rod/stroke ratio.

but remember, when u add on the deck plate you will need to do some fabrication as it raises the hieght of your head. make sure ur wastegate will fit under the hood too, and u will need a new downpipe made for sure..

B17a cranks are rare and hard to find. and like someone said earlier, aftermarket rods are rare for that motor too.

and just to make it double clear. the B20B/Z and B18A/B all have the same exact crank.

personally I am a fan of the stock GSR bottem end bored to 84mm. comes stock w/ a block girdle, can rev to 8500 stock, and has a good mix of torque and high revs w/ its 1.57r/s ratio. just my opinion.


[Modified by DIRep972, 6:37 PM 11/1/2002]

E Swift

Wow! I made this thread in July, and its back up? Damn!

Boo Boo'n

4 stroke, are you the dude from springfield that works at CVS?

B20Coupe

well...the one thing i know is if yu have a b20 and want to go all motor....a b17 crank is the thing for you, however you do have to de-stroke the engine to compinsate for the b17 crank....BUT it is good for 10,000 rpm, or so im told, AND if you dont have a b17 crank there is one for sale on

http://www.jdmhondaparts.com
-so check it out!!!
and good luck

The_Head

What do you mean by this? Am I missing something?

Just switching cranks from B20 to B17 destrokes the motor.