Detailed D17 NA Build Research- COMMENT HERE!!!!

[bomerman19]

120 hp 118 tq with the stage 3 cam. 112 tq at 2300 rpm and does not go below 110 tq till 7500 so it has a nice torque band in it but does not make as much power as it needs to. There is not enough static compression in the motor for the stage 3 cam. basically the stage 3 is to big of a cam for the d17 engine without high comp pistons or boost thrown at it. The stage 2 cam is going back in hopefully some time soon depends on the weather and my class schedule, and then hopefully to a dyno to to see some numbers.

To remove this ad, register today for free or log in if already registered!

[Raging Monkey]

Ok so in reading about MY engine the D17A1 (02 DX) I got a little confused as to what the flow of air is exactly... could someone throw down a quick explanation of the air flow from the intake to the exhaust (i know it's not a quick subject) but maybe just an "Air = x > x > x >" type of thing

[bomerman19]

hmmmm not really sure what it is you are asking for exactly but I will try to help on the D17a1 the non v-tec motor the air goes into the intake past the intake valves squished then banged and shot out the exauhst valves on the other side. Now the D17a2 tends to do it slightly differrently below 2400 rpm were instaed of opening both intake valves all the way at the same time it opens one all the way and one half way which in turn helps create a swirling effect to better blend the fuel and air audi's tend to swirl the air alot in there motors so the can run either more boost or higher compression.

If you want an actual formal on how the air flows I can't really help you on that cause it is constantly changing due to air pressure, temp, rpm, and a bunch of other factors

[army12bc]

so from what i under stand bomberman didn't get any hp and only 3lb torque (stock D17A2 listed 127hp @ 6300 and 114tq @4400) from his setup. has anyone got any numbers building na high comp, bore, overbore valve, ect?

[bomerman19]

the 127 hp and 114 tq is rated by honda at the crank. a stock d17a2 dyno's in at 90-95hp tops if it is really cold. and no one has # for high comp because no one has run high comp pistons yet. and oversized valves are kinda pointless on an N/A build because you will lose too much air velocity with bigger valves which in turn will just hurt you.

So in reality I picked up about 30 hp and about the same amount of torque. I have made 144 on the stage 2 but that was set up really bad I should be able to break 150 easy though when I switch the stage 2 back in.

[bomerman19]

dbl post FTL this site sucks it won't stop trying to double post everything i submit AHHHHH!

[army12bc]

no one has run high comp huh? i'm just getting to my engine part of my build, did all the suspension audio and tranny swapped, among bolt ons......maybe i should tryi it and see what i get instead of goin turbo

[bomerman19]

the math says you will get 12 hp my goal is to break 170 but that I think that might be pushing it.

[army12bc]

where did u get this math lol i can't find any equations or software to do that. i saw one civic with turbo goin like 400 hp dyno'd with dynojet. we should be able to do the same without turbo under the right build

[lordhelmet]

Freaking spammer got me excited. I thought there was an update. sigh.

[bomerman19]

you wana update honda only has 3 std bore gx pistons so you would need to order the 3 and then wait while they make you one. so I think I might mess with the gx later like say this winter or next summer on my spare block I do now have a full flow benched and p&p head so with all that I trying to shoot for 180+ but I have a turbo going on in like 2 weeks

[twin]

have any of you guys have hear about port and polish head. they make the volume efficiency of the engine goes from 85% to a 100% it do wonder to a n/a engine it doesn't cost that much and it is not that radical. aslo you can raise the compression of the engine by milling the head. however i would not sugest high compretion engine for dealy driving they tend to blow preaty fast.

[speedfoos]

^ lol.

[bomerman19]

Originally Posted by twin

have any of you guys have hear about port and polish head. they make the volume efficiency of the engine goes from 85% to a 100% it do wonder to a n/a engine it doesn't cost that much and it is not that radical. aslo you can raise the compression of the engine by milling the head. however i would not sugest high compretion engine for dealy driving they tend to blow preaty fast.

first their is no way to get 100% efficiency. yes you can improve the flow especially since this head is so restrictive. but and secondly P&P is anything but cheap it starts at about $1000-$1200 and goes up for a good port job. you can get a $250 job but that is just basically cleaning up some of the casting marks you won't do enough to gain any power. also another problem with doing a port and polish job is it depends on your application you can't just bore out the whole thing for N/A other wise you will loose too much velocity. So basicly you would need something flow-benched $$$ or you need that old guy that has lived on the f1 circuit for the past 65 years that can port like nobody's buisness cause a really good port and polish job is an art form.


milling the head won't net you that much compression at least not enough to make it worth while and the valves are already close enough to the pistons as is. high compression is fine for a dailly driver they do not blow up as long as your tune is good

[twin]

look i dont know how mush a port and polish job cost where you live, but down here in miami it goes for a lot cheaper and they and awsome job belive me. second, it doesnt get to be 100% efficiency,however it get preatty close to it. the only way to achive it is with boost do the math. third high compression engine do tend to blow preatty quick due to the the fact that ultra high high compression system are more susceptible to detonation wish could ruin your motor in just one cylce, and you are right they have less chance to blow up if you spend a lot of money and time in the dyno, however the same goes for every system in the market.