My New 1979 930 - yes, another introduction...

[16Volt]

Yay!

My car is back at Bernie's keeping yours company again.

[kenikh]

I love it when a plan takes shape.

[onboost]

Tell us about those pistons!

[kenikh]

The pistons are your basic 98mm JE turbo piston. 8.5:1 CR and have had the skirts coated by Calico. I was going to have them fully coated, but my mechanic said just do the skirts, taking into consideration the success he's had with all of the 935s he's rebuilt over the last 40 years.

Heads and pistons are getting CCed today. I'm guessing the final CR comes in closer the 8:1 than 8.5:1, given the pocket for the second plug. Cylinders just came back from boring and replating, too.

Also, notice the boss that was drilled and tapped into the heads for the 993 knock sensor bar (bottom pic). I am loving the security of knowing that I'll have knock control to back out timing and boost, if needed.

More pics:

[onboost]

Originally Posted by kenikh

The pistons are your basic 98mm JE turbo piston. 8.5:1 CR and have had the skirts coated by Calico. .

Cylinders just came back from boring and replating, too.

Also, notice the boss that was drilled and tapped into the heads for the 993 knock sensor bar (bottom pic). I am loving the security of knowing that I'll have knock control to back out timing and boost, if needed.

I thought they may be JE, and was wondering if you went 8.0:1 or 8.5.. nice!

Curios since you were boring and replanting cylinders why you didn't move to full fin?

The 993 knock sensor bar is a very nice item to have w/EFI nice call

[kenikh]

Originally Posted by onboost

I thought they may be JE, and was wondering if you went 8.0:1 or 8.5.. nice!

Definitely wanted better off the line throttle response. Even an SC feels a little soft to me, so every little bit helps.

Originally Posted by onboost

Curios since you were boring and replanting cylinders why you didn't move to full fin?

I wanted to keep the motor looking original and all of the data points I've gotten from those with decades of experience is that full fin really doesn't impart a quantifiable benefit.

Originally Posted by onboost

The 993 knock sensor bar is a very nice item to have w/EFI nice call

Who said anything about EFI? I'm keeping the CIS, even though I'll be using a Tec3R. No one said you have to use the fueling portion of the ECU.

[onboost]

Originally Posted by kenikh

.

I Who said anything about EFI? I'm keeping the CIS, even though I'll be using a Tec3R. No one said you have to use the fueling portion of the ECU.

Ahh this is true, assumption on my part was efi based on use of tec3r. Although yes it does offer other uses, without fueling portion.

[kenikh]

Originally Posted by onboost

Ahh this is true, assumption on my part was efi based on use of tec3r. Although yes it does offer other uses, without fueling portion.

No one ever said that the EFI component couldn't be manifested through a single injector for wideband keyed fuel trim adjustment/enrichment...but that's crazy talk.

[onboost]

Originally Posted by kenikh

No one ever said that the EFI component couldn't be manifested through a single injector for wideband keyed fuel trim adjustment/enrichment...but that's crazy talk.

Yes, and nor did I.. although I thought that may be where you were head, thanks for confirming. I would think it to be a lot more accurate/efficient and manageable than some of the earlier "extra" = 7th injector solutions. How many of those have we pulled off these cars?

[kenikh]

Originally Posted by onboost

Yes, and nor did I.. although I thought that may be where you were head, thanks for confirming. I would think it to be a lot more accurate/efficient and manageable than some of the earlier "extra" = 7th injector solutions. How many of those have we pulled off these cars?

I'm a long way from actually considering doing this, as i don't think I'll ever build this motor into something that will need more fuel than CIS can provide. That said, a single injector just down stream the throttle body and hidden from outside eyes could possibly be used to sharpen throttle response of the admittedly lazy CIS system.

All conjecture at this point. I have to get the car running first!

[kenikh]

So it begins...we have bearings, crank and rods assembled.

[kenikh]

Progress continues, but hit a minor snag with the cams...the cams just weren't quite up to snuff with the build quality and spec anymore. When this was initially going to be a bang-bang reseal, I wasn't too concerned with the minor peripheral pitting on the DC15 cams. But since I've decided to go all the way, revisiting the cams was a must once I got another look at them.

So, I sent a spare set of 993SS cams out to Dougherty to have the oil pump drive added - I expect them back next week. Let's just say the "boot in the back" character of this car is going to be something...and the K27-7006 isn't quite enough turbo to take full advantage of the cams. We can address the turbo later.

BTW, check out the 993 knock sensor bars!

Obligatory pics:

[dwarchi]

Finally managed to get some photos of the Ruf speedlines you sold me
Kenik. I'm liking the look.....it's a bolder look, less delicate look than the standard 16" Fuchs, but I'm happy!
I'm also enjoying living the rebuild vicariously though your posts. Looking forward to seeing you latest ol' girl on the road.

[Tom F2]

No air deflector plates across the tops of the cylinders?

[kenikh]

They look even better down under!

[TurboKraft]

Originally Posted by Tom F2

No air deflector plates across the tops of the cylinders?

Not on factory 97mm "bald" cylinders.

[16Volt]

Updates?

[kenikh]

Waiting for cams... :P

[kenikh]

No longer waiting for cams... Tracking number in hand and we are back on track!

[16Volt]

Make me a deal on that now worthless K27......