What to do when CIS works perfectly?

[RSBob]

Fie on you good Kenik.

For reasons unbeknownst yea I be in olde English mode, however since I most temporarily reside in Boston, where the British oppressors had their @$$e$ handed to them....

[Reiver]

Originally Posted by kenikh

Missed it was a Euro, so yes, good compression. Win! IIRC, large port was 78-79 only. Did Euros keep large ports?


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Yes, in the 82-83 models.

[Jonny H]

Two options for ya:

240 BHP on CIS (hi comp pistons and cams)

Replacement CDI Unit

232 BHP on PMOs (no internal mods to engine required)

https://www.impactbumpers.com/forum/index.php?/topic/30521-30-sc-with-pmo-carbs-and-cdi-dyno-plot/

The CIS route will be more 'streetable' but the PMOs more shouty!

[Litle brother]

Originally Posted by Jonny H

Two options for ya:

240 BHP on CIS (hi comp pistons and cams)

Replacement CDI Unit

232 BHP on PMOs (no internal mods to engine required)

https://www.impactbumpers.com/forum/index.php?/topic/30521-30-sc-with-pmo-carbs-and-cdi-dyno-plot/

The CIS route will be more 'streetable' but the PMOs more shouty!

PMO is also very streeable. My twin spark 3.2 short stroke puts out 283bhp and 345Nm with hot cams. It has a very flatt torque curve with 245Nm at the wheels at 2500rpm. and 293Nm at the wheels at 5180rpm.
Costs a lot to build, but WHAT AN ENGINE, real hot in a 1200kg targa


Ta

[Litle brother]

Originally Posted by Reiver

Yes, that's what I have in mind along with a 964 cam.....yup

You could also use the 993SS camprofile. Gives even more grunt. Or you could "play" with advancing/retarding the 964 cam. One way gives more torque, the other more power.
Think the 993SS is the hottest one when using original pistons.


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[Reiver]

Interesting options there....

I doubt I'd go back to carbs....FI throttle bodies would be more like it.

[kenikh]

993SS and GT2 cams are the only common plenum cams I like. 993SS is actually pretty great.


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[Jonny H]

^^ No doubt , PMO twin plug SS motors and FI throttle bodies make a powerful motor.

My impression was the OP was looking for a slightly 'easier' upgrade path. Might be wrong though.

[Reiver]

Originally Posted by Jonny H

^^ No doubt , PMO twin plug SS motors and FI throttle bodies make a powerful motor.

My impression was the OP was looking for a slightly 'easier' upgrade path. Might be wrong though.

No, you are correct...the rebuilt 930-10 I have is excellent and redone by a master builder...I use about 8-10oz of oil between 3k changes. With the SSI's/Dansk and the lightening I've done (2450 lbs with 20 gallons of fuel) it moves nicely.
What, estimate as set up 220hp as a guess.
What compression were you referring to Johhny as I've the 9.8-1 Euro now?

[Litle brother]

Originally Posted by Jonny H

^^ No doubt , PMO twin plug SS motors and FI throttle bodies make a powerful motor.

My impression was the OP was looking for a slightly 'easier' upgrade path. Might be wrong though.

Of course Jonny my bad

Then I can sum up the spec on my previous build:

3.0 SC Euro with 9.8:1 cr and 39mm intake ports.
964 cam, lift 1.35 at TDC
46mm PMO ITB
Singelplug
Electromotive Full sequential ECU
SSI

This setup was dynoed to 253bhp and 290Nm. on a Dynapack.




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[Reiver]

Originally Posted by Litle brother

Of course Jonny my bad

Then I can sum up the spec on my previous build:

3.0 SC Euro with 9.8:1 cr and 39mm intake ports.
964 cam, lift 1.35 at TDC
46mm PMO ITB
Singelplug
Electromotive ECU
SSI

This setup was dynoed to 253bhp and 290Nm. on a Dynapack.




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Hey, appreciated your input...no 'bad' about it.

That run down looks pretty damn nice.....

[Bob Kontak]

Originally Posted by Reiver

What compression were you referring to Johhny as I've the 9.8-1 Euro now?

Just arm chair talking. On my 81, Engine Builder's Supply cut 0.006" off the heads to facilitate a fresh face for the new seals.

I did the volume calcs and it added 0.2 compression to my 9.3:1. Maybe you have 10:1?

[Reiver]

Originally Posted by Bob Kontak

Just arm chair talking. On my 81, Engine Builder's Supply cut 0.006" off the heads to facilitate a fresh face for the new seals.

I did the volume calcs and it added 0.2 compression to my 9.3:1. Maybe you have 10:1?

No idea...I run 91 (only thing in Az) + an additive for higher octane and have never had an issue...but the engine does pull strongly from 3200...I'll call Howard up and ask about that...he did the work.

[Bob Kontak]

Originally Posted by Reiver

No idea...I run 91 (only thing in Az) + an additive for higher octane and have never had an issue...but the engine does pull strongly from 3200...I'll call Howard up and ask about that...he did the work.

Just a data point. I don't know if 9.8 vs 10.0 means anything. Frankly, I kinda wish they would have shaved 0.012" off if there was no downside, save premium gas.

Guessing Howard knows a touch more than me.

[Reiver]

Originally Posted by Bob Kontak

Just a data point. I don't know if 9.8 vs 10.0 means anything. Frankly, I kinda wish they would have shaved 0.012" off if there was no downside, save premium gas.

Guessing Howard knows a touch more than me.

10 or close to it is the limit I'd say for 91....altho I do boost it as best I can....I had a 930-16 US 83 and you can def feel the dif in real terms.