Hey i was wondering if anyone has ANY dyno charts that shows differences before and after just stroking; boring; or bigger injectors. im really curious about each approaches potential and the difference they make.

 

bigger injectors won't give you any more power unless the previous ones being used didn't deliver enough fuel. The dyno threads can give you some indication of certain "trends" that occur power wise, when increasing stroke but bore size increases are probably harder to track. Most engine theory books can give you some idea of what changes in these areas will give you percentage wise but there's no such thing as a set number gain for a certain increase in bore or stroke. It's highly dependant on all the other modifications and part combinations that are in place.

 

I believe ImportBuilders did something like this back in the day...
They took a completely stock B16, dynoed it, and then built a 2 liter bottom end.
They swapped everything over to the new 2L block(manifolds, throttle body, everything) and re-dynoed for a true back to back comparison...Or as close to it as possible.

I think they gained like 60 whp from just a block swap...I'm going off memory here so dont quote me on anything...

 

This is not always the case. If you have old school injectors, then you'll gain power due to the newer technology; spray pattern. A guy put bigger injectors in his AP2 and gained power across the board; his duty cycle was around 90% before the install. You also should factor in the better fuel economy sense you can run very lean in you're "cruising" load points.

 

I picked up 27whp and 26 tq going from stock h22 to stroked bored built short block.

I've got the dynos floating around my website wiki

 

All that means is that better injector technology was responsible for the power gain and not the size. I run the new Bosch ID style 1000cc injectors and replaced my old RC 310s but the gains I got was from the spray pattern and not size.

 

Before/After dyno on my car. Cylinder head and bolt-ons remained the same. Only change was the shortblock.

 

I miss that site Jeff had "ImportReview".

 

I took a look at your website. Interesting stuff man but I couldn't find that dyno

Thanks that really helped. That's after stroking or boring a b18 to a 2.0 L?

 

Sadly my wiki was hacked sometime back and I lost a good many articles I had on there orginally. Been to busy/lazy to get them back up

 

Before:
Stock B18C5 Block

After:
85mm Benson Sleeved B18C
Eagle Rods
CP 12:1 off-the-shelf pistons
Balanced/Micropolished GSR Crank


Pretty basic.

 

You gotta love the torque increase on that one, almost 22ft lbs more on a Honda is pretty substantial.

 

22 ft lb gain is actually impressive for hondas.

And what about that 325/225 98 prelude? G16racer? I wanna check that out!

 

Correct. I just meant that typically when going with a bigger aftermarket injector, you'll usually see gains compared to OEM.

 

Check prelude section

 

Not trying to give you a hard time but what you said seems to contradict what I said...