Reasons WHY the Prelude B20A and B21A cranks are "Weak"?
01-23-2005, 09:25 AM
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Reasons WHY the Prelude B20A and B21A cranks are "Weak"?
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" »</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!
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" »</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!
01-24-2005, 04:38 PM
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Re: Reasons WHY the Prelude B20A and B21A cranks are "Weak"? (Dulluthkid_19)
R/S ratio. The cranks themselves are not weaker than any other Honda crank.
But depending on rod length/pin location/etc. it can result in a crappy R/S ratio for the engine - placing more lateral stress on the cylinder walls.
But depending on rod length/pin location/etc. it can result in a crappy R/S ratio for the engine - placing more lateral stress on the cylinder walls.
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