Dulluthkid_19

I've read on here by numerous people claiming that they know of someone who ran the 95mm cranks that came from the 3rd gen prelude 2.0Si/Si (88-91). They say they are weak?

On my forum, PreludePower.com (3rd gen luders safe haven), we never had a problem with our cranks - i've never heard one thing that went wrong with them.
Tony Baker is running a fully built b20a with a factory crank and hes running huge boost, nitrous, and methanol - beating low 12 second cars. This guys car is street legal with street tires, all ready to go - no track car here. And he hasn't mentioned one thing about the crank being a concern whatsoever.

And another thing, how do you guys (Non-B20a B-series guys) use the Prelude crank in your B18a/b or B20b/z? Our thrust bearings are on a different crank journal than yours.
Here's a post from Preludepower.com to show you guys what I mean...
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by "chrisb" &raquo;</TD></TR><TR><TD CLASS="quote">This topic is something I am messing with right now. I have an LS crank and it fits just fine in my B21 block. However, the thrust bearings for the LS crank are on the #4 main journal while the thrust bearings are on the #3 journal for a B21 crank. Not good. That crank won't work. Since you hear of people interchanging, GSR, LS and CRV cranks I would bet they all have thrust bearings on the #4 main journal. I have emailed some people to try to find a Honda crank that has thrust bearings on the #3 journal.
Take care,
Chris Brinson</TD></TR></TABLE>
Can you explain how you B18ers and B20b/z guys would make the prelude's 95mm crank work? And how is it supposedly weak? It's twist-forged just like all a lot of Honda cranks are.

Thanks Guys!

Dulluthkid_19

bump

B20luda

know one has prolly done that before...as it would make the rod ratio worse...are u interested in doin it... BTW im at around 250whp with my b20a havent had any issues with it..

kabaroo

bump from someone else from duluth.... i thought i was alone.

rioninja

I've never heard anyone call them weak, ever.
What most people like to say is that they have a shitty rod-stroke ratio.
Which is usually true, for most of the high reving engines people are usually building.

The b20a crank is used in a few off the shelf stroker kits. I have never seen one,
but i always assumed that they were just machining the crank for the differently
placed thrust bearings. I mean, there is more than enough meat left on the casting
isnt there?

Dulluthkid_19

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kabaroo &raquo;</TD></TR><TR><TD CLASS="quote">bump from someone else from duluth.... i thought i was alone.</TD></TR></TABLE>
Heh...Wow I thought I was all alone here as well....

Dulluthkid_19

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rioninja &raquo;</TD></TR><TR><TD CLASS="quote">I've never heard anyone call them weak, ever.
What most people like to say is that they have a shitty rod-stroke ratio.
Which is usually true, for most of the high reving engines people are usually building.

The b20a crank is used in a few off the shelf stroker kits. I have never seen one,
but i always assumed that they were just machining the crank for the differently
placed thrust bearings. I mean, there is more than enough meat left on the casting
isnt there?</TD></TR></TABLE>
Yeah I suppose you could machine it - I havent looked. I've never thought of the idea personally - just curious of what the other guys did when they used the b20a crank.

rioninja

It may possibly be a combination of maching the crank, and using specialy sized thrust bearings.