im thinking of building a really radicle ls vtec build...

ive build one strong and reliable ls vtec and want to build a REALLY QUICK all motor one..im really wondering how big i can go on the cams without having valve clearence issues.. any suggestions will be greatly appreciated..thanks

 

p to v clearance doesnt really depend on bore size its more related to the piston dome size....I would worry more about how thin your sleeves are going to be if you go 87mm, you know that area where the sleeves connect. Is this going to be a daily driver?

 

No its not gonna be a DD. Just a weekend racer.

If there is a formula or something I can use to determine my p to v clearance that would be really useful. If there isn't one what can I do to find out? Thanks

 

How many times can the wheel be invented?

 

I don't know but hopefully this is my last time for a while.

 

You ... Let me rephrase-A competent builder can build an 11.5:1 LS VTEC with an 85mm bore that will make more power than a "radical" 13.5:1 87mm LS VTEC and be more reliable

 

You know your probably right and I'm really glad they can.

Ok so what does that have to do with what I asked??

I really appreciate your comment and ill add it to my memory and remember it for some later time in life but for now if you can't help me with my question can you post elsewhere.


Thanks

 

Well, considering he's built and tuned more high whp NA and turbo motors than you have seen. He's trying to steer in you in a direction where you may have some success.

Based on your questions, you have a very large amount to learn. Building a 87 mm bore motor is not for a beginner or even intermediate level of skill.

I second B19coupe's recommendation. It will save you a lot money and last a lot longer.

 

I am offering you a suggestion on how to meet your expectations without floundering around with a build that will only lead you to disappointment.


Let me put it this way: Reliability, 87mm bore, 13.5:1 and LSVTEC do not go together. We see lots of motors with high compression, large displacement, etc. that do not make as much power as well put together motors with less compression. Rather than focusing on "radical", look to put together a good combination that will make the power that you desire, without sacrificing reliability.
A little hint about compression and power: a higher compression piston requires a higher dome-the dome actually impedes flow and hurts power. The motor with lower compression will make less torque, but at higher RPM the lower compression motor will flow more air and make more power. As to cams-Skunk2 Pro2's and Pro 3's work quite well on B-series engines.

 

Any specific hp goal? "REALLY QUICK" is highly subjective.

 

But then again, if he were a competent builder he could make more power with the 13.5:1 87mm...A little hint about displacement and compression. The more displacement you have, the easier it is to achieve a higher compression. He would reach his desired compression with a stock PR3 dome.

 

I didn't mean to sound like a dousche there but I'm not building this to be the fastest car on the East coast or anything.

I'm just building this for me if it doesn't run ill live.

I really appreciate your suggestions but if its that easy its not a challenge.
Alternate builds aside can we determine how big my cams are gonna need to be before my valves get eaten by my pistons.

 

the sleeves will be fine but i worry about headgasket seal.
what gas do you plan on running by the way?

 

A guy I work with us converting his small block to run pure ethanol and that's what I would like to run in this motor.

But ill probably just run 114 race fuel

 

Bump for anymore help