how high would u guys recommend reving a b20/v wit bottom end built no block guard and bored to 85mm? how much can the walls handle w/o calapasing i also dont have a main block girdle ive heard my dif opinions i dunno im thinkin no more than 7800ish give me ur opinions

 

7500 imo

 

keep em comin would like dif opinions

 

i take my stock block to 8000 no problems but change the oil every 1200 miles and filter every other

 

yea i have thinner cylinder walls im bored ot 85mm

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by imptricer &raquo;</TD></TR><TR><TD CLASS="quote">yea i have thinner cylinder walls im bored ot 85mm</TD></TR></TABLE>
you running stock sleeves on 85? how is the relibility? how is your highest rev?

 

its almost built this is why im askin this qeustion

im also gona b running a 50 shot at the track im for sure the walls can withstand that b/c a stock motor can handle a 50 shot wit ease

let me know

 

?

 

need opinions still

 

I dont think you'll find too many people in here with 85mm overboarded stock b20 sleeves with a 50 shot on top of it, seeing how Nitrous is an FI topic, and this is the All Motor forum.

 

your walls will crack SOON.....

DO NOT BORE the b20!!! YOUR WALLS WILL CRACk


did i say your walls will crack??

unless you are sleeved

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by imptricer &raquo;</TD></TR><TR><TD CLASS="quote">its almost built this is why im askin this qeustion

im also gona b running a 50 shot at the track im for sure the walls can withstand that b/c a stock motor can handle a 50 shot wit ease

let me know </TD></TR></TABLE>


hahaha.....you are gonna crack your walls!!!

I WILL BET money on it within 1000 miles!!

 

nah i know a guy that has a bored b20 85mm and he runs it hard autox for one whole season now hes rebuilding it now ill c wat he finds

what other opinions

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by imptricer &raquo;</TD></TR><TR><TD CLASS="quote">nah i know a guy that has a bored b20 85mm and he runs it hard autox for one whole season now hes rebuilding it now ill c wat he finds

what other opinions</TD></TR></TABLE>

How can you say "nah" to people offering you opinions and in some cases very knowledgeable people such as Chad?

You are the one who asked the question, remember? Usually you ask a question because you dont know the answer, not the other way around.

 

i knwo its opinions every has them and yes i think opinions i was just saying ive seen that done b4 lol

 

I've seen 250 shots on automatic stock motors, doesnt mean its wise.

 

yea 50 i dont think would b pushing it just stock motors on stock internals would hold a 50 shot

so im still wondering where to shift the thing lol 7200-7800?

 

same here, i also in progress of building 85mm b20 , but im going to re-sleveed it with some thicker sleeves. better safe than sorry

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by imptricer &raquo;</TD></TR><TR><TD CLASS="quote">yea 50 i dont think would b pushing it just stock motors on stock internals would hold a 50 shot

so im still wondering where to shift the thing lol 7200-7800?</TD></TR></TABLE>

of course its pushing it, ur the only one in this thread saying its safe, its not safe, its a timebomb

a dyno will tell you where to shift it

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by imptricer &raquo;</TD></TR><TR><TD CLASS="quote">i knwo its opinions every has them and yes i think opinions i was just saying ive seen that done b4 lol</TD></TR></TABLE>


THESE ARE NOT OPINIONS!!!!!! they are FACTS.....you bore a b20 to 85mm and IT WILL CRACK....just depends on how hard you drive it...but it will eventually crack....

your autox buddy....DON"T BELIEVE IT....a b20 wall will not hold 85 mm...especially since i know he has a high compression piston in there since honda don't make an 85 mm b20 piston!!!

it might survive if it has block guard but i guarentee if you drive it hard for 200 miles it will crack....

peace!!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by imptricer &raquo;</TD></TR><TR><TD CLASS="quote">im also gona b running a 50 shot at the track</TD></TR></TABLE>
Don't sneeze while your squirting... It'll make the sleeves crack.

 

whats that sapose to mean

 

It means that if you sneeze [burp, fart, blink, or whatever] while squeezing a 50 shot on an 85mm stock block B20x, your gambling against the extremely high odds of cracked sleeves...

If you are keen to odds, my money says that the first crack will occur where the #3 and #4 cylinder merge together on the exhaust side of the block. You will also notice some separation of the casting from the sleeve between #2 and #3 on the exhaust side by the time you decide to take the head off.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by imptricer &raquo;</TD></TR><TR><TD CLASS="quote">how high would u guys recommend reving a b20/v wit bottom end built no block guard and bored to 85mm? how much can the walls handle w/o calapasing i also dont have a main block girdle ive heard my dif opinions i dunno im thinkin no more than 7800ish give me ur opinions </TD></TR></TABLE>

It really depends on the "build" of the engine. Compression ratio alone is a detrimental factor on unsleeved b20 builds. 12:1 compression on a stock b20 engine will simulate cylinder pressures equivalent of the engine seeing boost.

Now when you factor that into the type of stroke you may be running in there now and you throw a whole new list of variables in. If you could describe more on the build it would be more accurate to pin a suggested rev limit.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mastarolla &raquo;</TD></TR><TR><TD CLASS="quote">It really depends on the "build" of the engine. Compression ratio alone is a detrimental factor on unsleeved b20 builds. 12:1 compression on a stock b20 engine will simulate cylinder pressures equivalent of the engine seeing boost.</TD></TR></TABLE>
Yup. Using a good set of rods and pistons will allow you to extend the RPM range of your rotating assembly, but it doesn't guarantee that your unsleeved block is up to the task.