What to expect at the dyno?

[X-Runner]

So far my mods are as follows and I'm curious as to what numbers I should be expecting later when we dyno the blaster. Any idea how much difference would an exhaust make? About 3 hours on the engine also.

.030 over Wiseco piston/rings

+4mm stroker crank

Cylinder ported for stroker crank

Milled head

Jetted to match obviously

Stock exhaust

 

[burnin'_oil_2001]

my guess would be low to mid twenties. the limiting factor is the exhaust as it is acting like a big cork for all of your work. my friend took out his daughters blasters silencer guts and rejeted and the things runs sooo much better. i would recommend doing this at least-- maybe you will get solid mid twenties maybe I:I

 

[burnin'_oil_2001]

almost forgot...depending on the exhaust, engine work, airbox, carb,and jetting you might see anywhere from 3-10 horsepower. again this is speculation and I am sure that others will have better info for you as there are alot of knowledgeable people on the site- and some active builders too.

 

[X-Runner]

Well it also has no air box lid. I plan to do a full exhaust, I know that is really killing the engine work. I want to do a before/after dyno though to see what gains are made and where in the power band, thats why I am doing one before as well.

 

[burnin'_oil_2001]

that is a great idea...then we will knowI:I

 

[nightmare420]

i hope the results aren't disappointing!! lol

 

[X-Runner]

i hope the results aren't disappointing!! lol

If its 17 (factory to the wheels) or less Ill cry lol

 

[yfz450bence]

If its 17 (factory to the wheels) or less Ill cry lol

right, now isnt that at the crank or something, i dont know, let us know what you get.

 

[Vootie]

Yeah, pretty sure it's 17 stock at the crank, like 12 at the wheels or something.

 

[X-Runner]

I was told 17 at the wheels. I can't see even if its 17 at the crank loosing that much.

 

[Vootie]

You'd be surprised the difference in hp from the crank compared to the wheels. Most manufactuers only give hp numbers at the crank, especially in the automotive industry.

 

[peacher213]

I know with a rear wheel drive car, you lose roughly 20-21% from the crank to the wheels...(automatic)

if its 17 at the crank, i can see 13-14 at the wheels