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Title: Switching from 45drla to 48 drla? Post by: tezer on March 29, 2012, 18:41:00 pm I have a new engine I'm going to build,and i was wondering
if there is much increase in hp if i switch from 45 to 48 this is normal carbs not tri jet and its going to be run whit 40mm vents is it wort the extra money? the engine is going to be 94 pistons and barrels 84 mm dpr crank Cb super pro heads whit fluff and buff fk 87 1-5/8 merged header i also maby is going to change to bigger header! what you guys think? Title: Re: Switching from 45drla to 48 drla? Post by: Torben Alstrup on March 29, 2012, 20:01:30 pm Most likely about 10 hp more.
T Title: Re: Switching from 45drla to 48 drla? Post by: tezer on March 29, 2012, 21:05:53 pm 10hp then its worth the money :)
Torben Alstrup you are a man whit experience in motors what do you think shud i switch to a bigger exhaust? this is going to be a weekend car and not a daily driver! Title: Re: Switching from 45drla to 48 drla? Post by: Zach Gomulka on March 30, 2012, 01:38:37 am What heads do you have?
Title: Re: Switching from 45drla to 48 drla? Post by: tezer on March 30, 2012, 06:20:35 am Cb performance super pro heads
Title: Re: Switching from 45drla to 48 drla? Post by: Torben Alstrup on March 30, 2012, 08:50:36 am 10hp then its worth the money :) The combo has potential for about 210 hp. A 1 5/8" header begins to brake hard at about 195 hp. So yes I think you should switch to a 1 3/4" header.Torben Alstrup you are a man whit experience in motors what do you think shud i switch to a bigger exhaust? this is going to be a weekend car and not a daily driver! T Title: Re: Switching from 45drla to 48 drla? Post by: tezer on March 30, 2012, 21:44:25 pm i will follow your advise torben and get a bigger header!
i can get a 1-7/8 header for a god price but i think that is to big! or can it be used? Title: Re: Switching from 45drla to 48 drla? Post by: Torben Alstrup on March 31, 2012, 18:34:38 pm Your choice. But for the engine size and parts the 1 3/4" is better suited. You will get more usable power.
T Title: Re: Switching from 45drla to 48 drla? Post by: tezer on March 31, 2012, 18:39:42 pm Will be losing to much on low rpm right?!
i think i bay a 1-3/4 I'm not going to be cheap on this motor so i just bay what is best for my motor size! thanks torben for your help! Title: Re: Switching from 45drla to 48 drla? Post by: Torben Alstrup on April 01, 2012, 15:36:37 pm Will be losing to much on low rpm right?! Yes. The Fk87 isnt exactly strong in the lower rpms, so the engine needs all the help it can get.i think i bay a 1-3/4 I'm not going to be cheap on this motor so i just bay what is best for my motor size! thanks torben for your help! I do not have loads of experience with 200+ hp type 1īs. But what I have seen is that even on a 2387 pushing 235 hp. the 1 7/8" was on the large side. For all out racing, fine. But the streetability was better with a 1 3/4", and it didnt really loose anything on top. It just maxed 200 rpms earlier. T |