How high can a 16 V engine be revved?

[xero]

b-series spin the wrong way.

[Hiro]

b-series spin the wrong way.

Would that matter if you use the Honda transaxle? It's going into an AW11, not a FR car...

[oldeskewltoy]

b-series spin the wrong way.

Not EVERY Honda B16 spins the wrong way............

[maj]

lol how off topic has this gone. racemr2 was after specific questions because he wants his MR2 to BEAT civics, not join them.

[Sam_Q]

you will need to fit a 20v silvertop oil pump with Toda replacement gears. Porting the pump is also a good idea. If you want parts for both of these let me know.

scottreichstein: 2ZZ engines don't rev to 9000, at that point their valve train destroys itself.

[racermr2]

I want to thank all the forum members for their timely and very informative responses. I'm still in a quandry(confusion) as to my goals for this engine and what is reality that is legal here in the USA for road racing(Sports Car Club of America). I believe this MR2 can be very competitive against the Hondas and Miatas but what is available(20v engines, ITBs, dry sump, higher compression,etc) for the 4AGE in naturally aspirated trim is not allowed by the rules. Yet no one in the USA has ever built a 10/10ths AE86 or AW11 for this tuner road race class. This is the reason I am researching and asking the questions of the "down under gurus" and "oldskewltoy".
Now to my next inquiry: 1.) If I limit the RPMs to 9k, what is the longevity of the valve springs with 10mm lift for road course racing of 45 min duration? 2.) what appears to be the weak link in the valve train? 3.) I want to use a 19 row oil cooler up front with -10 braided line, I also understand that this distance will create severe pressure drop for the stock oil pump. If so, what would be a recomendation for oil cooling using a stock oil pump required by the rules.

[Sam_Q]

With the right springs I can't see why they wouldn't be able to run for 200,000km. Supertech seems to be the way to go there, cheap and reliable. 10mm of valve lift will not put them under much stress at all, I think by memory the supertech are rated at 15mm.

[oldeskewltoy]

With the right springs I can't see why they wouldn't be able to run for 200,000km. Supertech seems to be the way to go there, cheap and reliable. 10mm of valve lift will not put them under much stress at all, I think by memory the supertech are rated at 15mm.

? do tell. I've never seen a tech sheet on the Supertech springs, do you have one to share?

1.) If I limit the RPMs to 9k, what is the longevity of the valve springs with 10mm lift for road course racing of 45 min duration?
2.) what appears to be the weak link in the valve train?
3.) I want to use a 19 row oil cooler up front with -10 braided line, I also understand that this distance will create severe pressure drop for the stock oil pump. If so, what would be a recomendation for oil cooling using a stock oil pump required by the rules.

Both Toda, and TRD have single springs that can accommodate 10+mm of lift(max of about 10.5), while fitting/retaining all the stock valvetrain... Road course racing is far easier then drifting (less banging against the rev limiter) with that said... the single springs are still the "weak" point... Dual springs will allow you to hit engine speeds approaching 14,000 rpm. As long as you keep the rpm to 9000-9500... (single spring valvetrain) there really isn't a weak point in the valvetrain.

I've been running my oil cooler (single row) plumbed with -8 line and my engine doesn't seem to lack oil pressure(I've not actually checked it after the oil cooler to be honest...) but 6000 miles so far. An Accusump system and an oil pan that keeps the sump filled is likely a bigger concern, or worry.

[racermr2]

OST: Your vehicle is an AE86 with an engine in the front; my vehicle is an AW11 MR2 with a transverse mid-engine layout. For you to mount an up front oil cooler you wouldn't have more than 5-6 feet of hose. Therefore, you would not experience any real pressure drop or loss of volume due to the short distance. The distance in my vehicle is 12 feet(one way) by the most direct route to the oil cooler. That's 24 feet up and back. My last race resulted in a blown engine. Just when it started to tighten up I looked at the oil pressure guage and it indicated 21 psi. I immediately shut it down but too late. Upon checking on return to the pits there was no oil leak in any of the external lines and the dipstick indicated 4.5 quarts in the pan. The oil temp guage indicated 315 degrees. My engine machinists went thru the engine and concluded it was insufficient oil to the bearings. Due to space limitations on an AW11 the only reasonable location with sufficient air for an oil cooler is up front. Anyone have any ideas?

[fixeruperer]

the mr2 has that side vent, put the oil cooler there, or under the car. or add another vent to the other side of the car and put the cooler behind there. the cooler doesnt have to go up front.
i run crower valve springs and run 8500-9000rpm. but not on a circuit so its not sustained over 30-35min so i cant help you there.

[dnegative]

Due to space limitations on an AW11 the only reasonable location with sufficient air for an oil cooler is up front. Anyone have any ideas?

Water to oil cooler
Mount it on the lid with a thermo
Mount next to the gearbox etc

[trdee]

I am running an oil to water cooler on my AW11

[oldeskewltoy]

PLENTY of good ways.... sometimes you have to think outside the box. Added advantage to a coolant cooled system is it helps with warm up too

[mattysshop]

error post

[racermr2]

trdee: What type(mfg'er) oil to water heat exchanger are you using and where did you mount it. Also, what temp thermostat are you using?