This is the engine we built for the OGK last year. Finally found time to get it into a car and run it. Some details:

85.5mm, 11.0:1Supertech pistons shaved to get to 10.5:1 BP4W, ported and polished SuperMiata shim under bucket lifters, Supertech 1mm oversize valves, Supertech single valve springs, custom .425 lift, 272° cams, lightened crank, BE oil pump, M-Tuned forged rods, ACL race bearings, adjustable cam gears, MS3 DIY PnP with sequential fuel, Racing Beat header, square top intake manifold, OEM T/B, COPs Toyota.

We spent about an hour on the dyno today with it. Still needs another hour or so to get the rest out of it. Still has a fairly conservative timing map and can probably take another 2-3° above 5000rpm. Have not messed with cam gears yet and that will probably yield some gains.

Running CA91 here. Rev limiter set at 8200 but it was still pulling obviously. Guessing it'll nose over at 8400 or so. 272° isn't very long and I don't think the OEM square top will allow much more than that. In fact, I'm wondering if the flat power isn't an indication of intake restriction from the manifold. We'll see the next time we go back. We have a B18/BP4w hybrid manifold to throw on there. That and E85 will get it past 200whp I'm sure.

Then we add the C30-94, or Borg-Warner 6258

 

image attachments hate you :(

 

Good HP numbers, but how much torque is that red x laying down?

 

Mad skillz... they be mine! Linked from 949 and m.net.


This is the engine we built for the OGK last year. Finally found time to get it into a car and run it.
Some details:

85.5mm, 11.0:1 Supertech pistons shaved to get to 10.5:1
BP4W, ported and polished
SuperMiata shim under bucket lifters
Supertech 1mm oversize valves
Supertech single valve springs
Custom .425 lift, 272° cams
Lightened crank
BE oil pump
M-Tuned forged rods
ACL race bearings
Adjustable cam gears
MS3 DIY PnP with sequential fuel
Racing Beat header
Square top intake manifold
OEM T/B
COPs, Toyota

We spent about an hour on the dyno today with it. Still needs another hour or so to get the rest out of it. Still has a fairly conservative timing map and can probably take another 2-3° above 5000rpm. Have not messed with cam gears yet and that will probably yield some gains.

Running CA91 here. Rev limiter set at 8200 but it was still pulling obviously. Guessing it'll nose over at 8400 or so. 272° isn't very long and I don't think the OEM square top will allow much more than that. In fact, I'm wondering if the flat power isn't an indication of intake restriction from the manifold. We'll see the next time we go back. We have a B18/BP4w hybrid manifold to throw on there. That and E85 will get it past 200whp I'm sure.

Then we add the C30-94, or Borg-Warner 6258 or 7064. Decisions..

 

I'd guess the header is more of a restriction than the intake. The collectors suck ding ding, and the primaries are pretty small on the RB header.

 

BTW, did you guys sonic check the cylinders on the block you used, or have you found Miata blocks to be plenty thick for the 85.5 bore size?

 

Aww, you took all the fun out of it. I wanted everyone to guess what the engine was. Image thing is a mt.net glitch.

As long as we're sharing..

M-Tuned fuel rail
Injector Dynamics 1000cc @ 60psi
Hondata manifold gasket
NGK BKR7EIX-11

We sonic test every engine we build.

 

Emilio, any way you'd post the current maps for that thing? I'm building a similar motor and could use a great starting point!

Thanks,
Greer

 

Nope. Use MS3. Pay for Tuner Studio. Let software tune your car for you. Win.

I do some manual here and there when the changes are big, or experimenting but we get some great looking datalogs letting the software tune itself.

 

I know what I'll be building now

 

There's a manifold for the chrysler 2.0 (neon) with huge runners / plenum that makes the power flatten like that:

 

Have you found many that aren't suitable for use with the bore that large, or are most of them fine? 2.5mm over sounds REALLY big for pedestrian engines like this.

 

Well my tec-2 is driving the motor so tuner studio and ms3 just aint there right now. I was looking for timing & a/f values as a reference.

-Greer

 

12.8-13.0 AFR. 26~32° on top

 

Thanks, I'll work between the OE maps I can grab and some stuff here. I appreciate it. The tec-2 is outdated so support is limited but any bit of data helps.

-Greer

 

This is VERY relevant to my interests.

Fantastic numbers so far Emilio!

 

Where did you get the cams from?

 

Custom from Steve Gruenwald (Integral) before he sold his designs to Megacycle. Good luck getting cams from them.

 

Head gasket?

 

Stock 94-00, trimmed a few thou to clear pistons.