I want to increase my intake manifold runner lenght by .25 of an inch. To hopefully bring down the rpm that my manifold will produce peak power.Would this be possible by building a Intake manifold to head spacer or stacking hondata gaskets? would .25 inch make a significant difference are there any readups you can link me to?

 

1/4" isn't going to do much, 200 - 300 rpm maybe
I've had a few K-series customer's play with ramtube length on our ITBs and generally speaking, every inch of runner is good for ~1000 rpm.

There are too many variables to say exactly what you should expect, but a spacer as you described would work. Try, observe, and learn.

 

Something people forget is that intake lengths start at the filter all the way back to the valve in the head. If you want 1/4" more, just add it to your intake tube length. That's why experimenting with intake tube length can make a big difference in power.

 

Here is the best in the business giving advice nice job Scott.
I would try a smaller TB with a nice tapered entry but it really depends on the rest of your setup.

 

why would you want to lower the rpm at which your motor makes peak power?

 

thats intresting, i knew about trying different lengths to make better power, but only thought of it to the TB and not to the intake valves.

Is the length of the intake coreospoding to air speed, as in how much air the motor can suck in/fill the intake manifold when the intake valves open to fill the cylinder? if that makes sence..

this is what im thinking that a short ram is easyer for the motor to pull in air because its a shorter distance to the valves so it would be easyer for the motor to pull the air and also travel quicker to the valves as it's a shorter distance. maybe thats why they say short rams make more peak then CIA?

 

its probly a street car and not strip car

 

i do know that with longer runners it will take the air longer you bounce off the back of the valves and then back wall of the inside intake mani

 

Kinda hard up on running the edelbrock victor x intake manifold. I do have a endyn ported intake manifold. The power still seems to drop off after 8500rpm. I want the motor to make peak a little higher like say 8500-8800. The edelbrock has a dip in horsepower accord to king motorsports intake dyno tests on 2.0 litre engines. just wondering what should be done. My car is a racecar with very little daily driving duty.

Also if i were to space the intake flange away from the head. I realized it would move the injectors back also. What side effects would this have?

 

it doesnt go by intake runners length it about how your car is tuned for 8500to8800 range

 

i dont understand, first you said you want to lower rpm but now you say you want to make power higher?

you say its a racecar. is it a drag car? if so you want to make peak power as high as possible....

 

can we have some details on the car and maybe a dyno graph ?

 

Why does tuning the actual intake pipe sound like it'll work. whats the difference between tuning the intake and tuning the manifold? wouldnt you want the resonance to work with each other??

 

This thread sounds interesting but I'm hella lost as I'm new to this intake length subject.

Ok, I'm thinking about double stacking the Blacktrax IAB spacer on my H22 with parts listed on my sig. What kind of increase will I see? I just want an image of what I'mma get myself into.

Right now I'm rocking just a single Blacktrax IAB spacer that had replaced my stock IAB spacer. I'm wondering if by adding another stack will add power? Maybe more power on the topend?

 

You're jacking his thread. I would keep reading if you're lost and learn as much as you can about intake tuning. From what I recall seeing, the blacktrax IAB spacers didn't really work.

 

Yeah, didn't mean to jack his thread but since people are discussing long runners & short runners, I thought I'd ask since its not that far/different from his. Its all good though; thanks for the answers.

 

anyone explanations? whats the difference between using a intake to try and produce a lower peak rpm or intake manifold to do so? if there is none i think i solved my problem Thanks!