I wonder...if you make some H23 cams with the same cam profile as the big lobe on the H22, which would be better? So instead of waiting for 5500 rpms for the big lobes, you'll be on the big lobes full-time.
But I guess you'll have to take into account airflow velocity and efficiency when running under lower rpms. Anyone like to contribute?
Off the subject a little... I know a guy who has a b16 in an 87 civic (the ones that look like icecream trucks), and he had his ecu reporgrammed so VTEC was always on. Would this be beneficial?
Originally posted by Brady92/4WS Off the subject a little... I know a guy who has a b16 in an 87 civic (the ones that look like icecream trucks), and he had his ecu reporgrammed so VTEC was always on. Would this be beneficial?
It would be if he didn't car about fuel ecconomy what so ever. All he is doing is only using one set of lobes. Just as if he had done a cam swap on a different engine.
Peace
__________________
93 Prelude Si
CAI
15" Montegi MR7's (Gunmetal)
Yokahoma AVC's (V-speed rated tires)
NGK plugs
Front strut tower brace
And of course manual
Civics are like tampons every pussy has one.......
Originally posted by Prelude_RCR I wonder...if you make some H23 cams with the same cam profile as the big lobe on the H22, which would be better? So instead of waiting for 5500 rpms for the big lobes, you'll be on the big lobes full-time.
But I guess you'll have to take into account airflow velocity and efficiency when running under lower rpms. Anyone like to contribute?
you are missing the whole point of variable lift & timing. If you put cams in an H23 that were as agressive as the high cam profile on the H22, you car would barely idle, much less have any usable power below 3K RPM. The H22 has MUCH more low end power then an H23 with agressive cams. In fact, the H22 makes about as much torque at 2000 RPM as it does at 7000. The reason you have to 'wait' for VTEC to engage is because the low cam is better suited to making power below about 4600 RPM.
If you put cams in an H22, once again you are WAY beyond the range of a streetable cam profile in an H23. Look at the specs on www.crower.com of the aftermarket cams for the H22. They don't start making power until about 5400 RPM, and pull all the way to 8500. Can you imagine how lame an H23 would be with cams that agressive? Sure, as a race car with a fully built, destroked motor that stayed above 6000 RPM for the entire lap, it would be ok....but for a street car... sorry. The H23 is a good motor but you can't compare it to the H22.
Its like comparing a mustang GT to a Cobra - sure, you can make the GT beat a cobra - until you start modding the cobra. Then its lights out once again .
I have two friends with 4-gen Preludes. Both are the same year, but one is a JDM H22 (bent a con-rod on his old USDM) and the other one is an H23. The three of us drove those two cars back to back for comparison, because we were trying to get a feel for each others' cars.
JDM H22 (CAI, exhaust) vs. H23 (CAI, exhaust)
THe JDM H22 pulls like a mad mofo. It pulls harder than a USDM H22, because it has raised 10.6:1 compression, and maybe different cam profiles. It's LOUD and pulls like a mofo throughout the rev range.
The H23 has something the JDM H22 dosen't have: Tall ass gearing, and low end torque. The H23 pulls as strongly as the JDM h22 at lower RPMs (which means the H23 pulls as hard, or harder than a USDM H22 until where VTEC is supposed to kick in...), but the upper range power is nothing compared to VTEC-endowed Preludes. Plus, the taller gearing feels a LOT taller than the H22 gearing.
Compared to the H22, the H23 gearbox would pull the car a lot more MPH for every RPM.
This issue has also been a subject of debate among my prelude-driving friends. H22? H23 turbo? Who'd be faster? I'd think, with a massive turbo setup on the H23, it would win, but with lower boost, the H22 would win the trophy with it's ability to spit gases out of it's exhaust side faster than the H23.
But I like purity. The H22's ability to have some kind of low end torque, and rev it's guts out with that wonderful Honda wail always gets me. The h23 sounds tame at high RPMs compared to the H22...
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One thing though....for the people who get too enthusiastic about combinging the high points of the two engines together....NEVER...I repeat, NEVER mate an H23 gearbox with the H22. The H23 gears are very tall, as you might notice if you drive both back to back. You'll have "Celica GT-S syndrome".
As for H22 heads on an H23 block...I've never been able to confirm if someone has done this before...if someone has, please tell me.
Yes, people have mated a h22 head to a h23 but it doesn't seem to last to long.
As far as vtec's high cam profile it's not terribly agressive. I think you could throw in a cam with the same profile in the h23 with out many problems(bump up the idle a tad)
As far as racing, the ability to have to cam profiles doesn't do much. You race in vtec. Vtec is nice though because when cruising around town that your car has some power at reasonable rpm's.
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