Cam specs

[sh123]

Hi.

Currently have a fully lightened and balanced stroker m44 engine with block capable of 8000rpm.

Stock head other than being ported.

Cams are listed as 244 with10.2mm of lift.

Car is very tame. It idles like a standard car and drives like a standard car with more power.

Im considering a set of catcams as ive found a cheap set.

Which are 283 / 284 10.75 lift.

Car is soley used for competition and is still on standard inlet.

Currently at around  169bhp and 165ftlbs i think

Im thinking of fitting above cams with a bbtb. What affect am i likely to get. Will it still be as driveable? More power? Torque?

[Darky]

Hi

Which inlet manifold and ecu are you using?
The e36 one is known to starve the engine of air! Might be better to go e30 or itbs first. But that depends on car.
Another thing to consider is whether the valves will hit the pistons with the increased duration and lift on the cams.

A few thoughts.

[sh123]

Currently run a e36/m44 inlet with standard ecu with a fully live mappable chip installed.

Have read about the e30 inlet but mapper suggested he gets better results as he can map the disa to take out flat spots etc.

I dont know about the valves but my engine builder will know. Ill give him a call next week at some point.

If i run e30 inlet will i need different harness and ecu?

[Darky]

What's the car?
E30 manifold will not fit in e36. Too tall!

[sh123]

Can always raise the bonnet/lower the engine if i will gain enough from changing it!

[Darky]

If it's an e36 I'd go itbs then! Which head did you use e36 or e30. 6 mm stem valves or 7mm.

[sh123]

Itbs are out the question im afraid due to race regulations.

E36 m44 head so they are 6mm stem. Ive opted for standard valves for now.

[Darky]

Hi Sion

That's right I remember now m44 head!

So it's a maf setup with the lightened 88 crank and 87 pistons.

I wonder if you could cut down the e30 inlet manifold a bit and do something like the inlet manifold of the guy who's doing that really nice turbo build here.
Hang on cut down a m50 inlet manifold?

[Darky]

Anyway try this because the disa inlet manifold was designed to give more torque down low,  but to do that they had butterflies in the inlet manifold and not a very smooth air flow. Which starved the normal m44 of air at decent rpm! Hence it had less go in it compared to e30 m42.

[sh123]

Yes thats me

Yes that looks very good!!

Ihave looked into the m50 manifold a while back.

Not sure who i could use to modify it.

Also not sure weather regulations allow. I did ask but no answer came back to me.

If i run a different inlet without disa i will need a retune? As my mapper has made use of the disa valve and mapped it into tje main map

[sh123]

Anyway try this because the disa inlet manifold was designed to give more torque down low,  but to do that they had butterflies in the inlet manifold and not a very smooth air flow. Which starved the normal m44 of air at decent rpm! Hence it had less go in it compared to e30 m42.

Do you think changing cams is pointless?

[sh123]

Here are the regs related

4. Engines with more than one camshaft per bank of cylinders may be used providing that they  were originally fitted with fuel injection and that the fuel injection system complete  with plenum chamber and throttle body is retained unmodified.
18.3.1. Fuel injection may be fitted where it was standard equipment by  the manufacturer for that engine type and where the original plenum chamber and throttle body is retained for that engine type.

[Darky]

Anyway try this because the disa inlet manifold was designed to give more torque down low,  but to do that they had butterflies in the inlet manifold and not a very smooth air flow. Which starved the normal m44 of air at decent rpm! Hence it had less go in it compared to e30 m42.

Do you think changing cams is pointless?

No essentially trying to do the same thing. The method I'm suggesting gets rid of the air restriction caused by disa giving you more air.
The bigger cams are opening the valves longer giving you more air. Increased duration!
However your new cams wider opening will give you more air but disa will stop that. Increased lift!
I think the disa manifold is already a anchor on your engine!
So I'd go both, but you will lose a bit down low with those cams.

[Darky]

With those regs it's time you got a e30 inlet manifold.
But you will have to cut it down to fit.
But that will only be on the runners, so legal!
M50 manifold won't be legal. Nor will altering the e30 manifold like the turbo build here!

FYI there are places that bore out the e30 throttle body, more air again! But it looks exactly the same!

[sh123]

Will it run fine without mapping?

Ill try and hunt a e30 manifold down just checked ebay none there.

Is the e30 tb different? A guy on ebay does bigger bore ones on exchange.

I also have an 320is e90 here with the 175bhp 4 cyl engine. Not sure if inlet off that fits? Although it looks entirely different and may raise questions at scruiteneering!