Educated Hp guess help.

[StereoInstaller1]

154whp would be one hell of a m20.

No, it would not. All the local racers (and there is over 40 cars) are all totally bone stock M20B25s, with whatever chip/exhaust/tuning, but nothing else.

Most are about 160

[nando]

people are just used to 200k mile M20s that have seen very little in the way of maintenance, probably have been overheated at least once and run on nothing but AM/PM Arco 87.

as far as how much it's making - save $50, go to a dyno, and find out. If the bottom end was fresh, 165-170 isn't that unrealistic. I have a dyno plot from a guy with a stock 2.5 bottom end and the schrick 288. he made 165whp at 6000rpm, and that particular cam will extend the torque curve well into 6500rpm so it could have been more. Of course it was also a meticulous race build, so a junker motor might make a lot less.

[E30Pedia]

No, it would not. All the local racers (and there is over 40 cars) are all totally bone stock M20B25s, with whatever chip/exhaust/tuning, but nothing else.

Most are about 160

To the wheels?? that would be on the 180+ crank hp. I think you mean 160hp not whp.

people are just used to 200k mile M20s that have seen very little in the way of maintenance, probably have been overheated at least once and run on nothing but AM/PM Arco 87.



as far as how much it's making - save $50, go to a dyno, and find out. If the bottom end was fresh, 165-170 isn't that unrealistic. I have a dyno plot from a guy with a stock 2.5 bottom end and the schrick 288. he made 165whp at 6000rpm, and that particular cam will extend the torque curve well into 6500rpm so it could have been more. Of course it was also a meticulous race build, so a junker motor might make a lot less.

My car has been very well maintained. I rarely drove it, i only put 3500 miles on it in 1 year. It only has 120k miles on the block and 1k on my new head. Never ran anything but Shell/76 91. If i can make 160 whp i will be extremly happy.

[RoDo]

To the wheels?? that would be on the 180+ crank hp. I think you mean 160hp not whp.

Yep, to the wheels. The M20B25 makes 168hp in new, stock form. The local racers (PRO3 cars) estimate they are making somewhere around 190hp at the crank with chip, exhaust & other miscellaneous allowed mods.

[nando]

To the wheels?? that would be on the 180+ crank hp. I think you mean 160hp not whp.



My car has been very well maintained. I rarely drove it, i only put 3500 miles on it in 1 year. It only has 120k miles on the block and 1k on my new head. Never ran anything but Shell/76 91. If i can make 160 whp i will be extremly happy.

spend the money on the head and you can do it easy. That means a good 3- angle valve grind, maybe have the valves back cut. Don't spend a lot of time on porting - clean up the bowls (there are some obvious casting ridges that can be cleaned up), smooth it out, don't polish the intake for heaven's sake. making the intake port bigger only makes the turbulence problem of the 885 head worse, so leave it alone other than gasket matching. the ports and valves are already a good size, but you can get +1mm valves if you wish. that will require some de-shrouding work in the CC, and goes better with an overbored block.

then you need some good springs - the ones schrick reccomends for the 288 are fine. soft springs will make the valves float and break rockers. Then get the IE heavy duty rockers, and send them in to be x-rayed. if there are any with flaws (pores, cracks) send them back. have them shot peened or polished. Build your head and tune it properly on a dyno (war chip maybe?). it will scream to a 7500rpm redline no problem. that means you want to keep a 4.10 lsd ;)

if you're just going to put a 288 cam in and the stock rockers/springs, you're stuck with a basically stock redline and are missing out on the high rpm VE potential (and horsepower increase).

[StereoInstaller1]

To the wheels?? that would be on the 180+ crank hp. I think you mean 160hp not whp.

I think I KNOW what I said, and I did not mis-speak. I also think that drivetrain losses in the 20% region might be true for old domestic TH350's, but would not apply to a G260 and a 4.10LSD

[PeaveyBassist]

I guesstimate my current 200k+ mileage m20 has abouts 220 WHEEL hpz

[JGood]

My completely stock (from airbox to muffler), except for a real Dinan chip, 260k mile 87 325is put down 143whp/145wtq.

http://apexeta.com/img/87325isdyno.jpg

[nando]

that's pretty healthy, nice smooth powerband too.

[Farbin Kaiber]

Over 9000.






No really, the best part is wondering who fuct up a new head job and it leaks oil. Maintenance, then hp estimates. You must be a typical Cali-bread rice boy.

[nando]

oh yeah, if you are actually building this PLEASE check your valve clearance at TDC, especially since you've skimmed the head there's about a 99% chance the valves will hit the pistons unless you cut the valve pockets deeper.

[E30Pedia]

I think I KNOW what I said, and I did not mis-speak. I also think that drivetrain losses in the 20% region might be true for old domestic TH350's, but would not apply to a G260 and a 4.10LSD

Well that is awsome hp for almsot stock e30. e30s lose inbwtween 13-15%.

My completely stock (from airbox to muffler), except for a real Dinan chip, 260k mile 87 325is put down 143whp/145wtq.

http://apexeta.com/img/87325isdyno.jpg

Thats a sweet ass powerband :up:.

Over 9000.






No really, the best part is wondering who fuct up a new head job and it leaks oil. Maintenance, then hp estimates. You must be a typical Cali-bread rice boy.

Exactly why i wont be dyoing my car. I gata fix the leak, then new injectors, seals and a valve adjustment. That guy that did my valve adjustment made it way to loose.

oh yeah, if you are actually building this PLEASE check your valve clearance at TDC, especially since you've skimmed the head there's about a 99% chance the valves will hit the pistons unless you cut the valve pockets deeper.

Yea thats taken care of. Am not sure how many mm's is cut down though.

Nando thnx for all the help :D

Here some pictures of the head and the manifold.









Manifold before i powder-coted it black.



Exhaust almost scraped the asphalt.





And Here is one picture of the engine bay:

[Farbin Kaiber]

Exactly why i wont be dyoing my car. I gata fix the leak, then new injectors, seals and a valve adjustment. That guy that did my valve adjustment made it way to loose.

Those things should have been done when the head was off. did you have a Shadetree Idiot work on your car? Why did you have someone else adjust your valves?

[nando]

he may have done it hot, which you can do, but you gotta be fast and you have to have a bit of experience at it. if you take too long the last valves you adjusted will be too loose.

[Mfever]

Those things should have been done when the head was off. did you have a Shadetree Idiot work on your car? Why did you have someone else adjust your valves?

You'd be surprised Farbin, not everyone on here is an idiot. What's with all the trash talk. I don't adjust my valves either, I don't think I am qualified to do that, hence the reason its the only thing a mechanic takes care of for me.