BC

I think that will proper sealing the early cars could handle enough CFM for 15psi if you cool the combustion temp with methanol.

hacker-pschorr

I plan on reaching 15psi on both of my OB's - they are lower compression though.

I took the Corky unit off my 81 last night & both fuel pressure regulators. In place of those I installed an S4 dampner - adjustable FPR & Vortech FMU from Tim's kit. I wasn't happy with the adjustment on the Corky unit under vacuum. Caused my car to be very rich up top under boost. This should allow me to seperate the two, and dial in more fuel for more boost. I have a smaller pulley on the way.

BC

I don't know why you don't just wire up some form of EFI hacker. It would allow the non-S4 people to stop screwing with dampeners, one-trick-pony fuel pressure regs, etc.

hacker-pschorr

My 79 will have EFI before I supercharge it.

The 81 is staying L-Jet until I run the EFI system on the 79 for a while, get the bugs worked out.

Now I'm REALLY thinking about buying Airflights Euro 80.....damn it

BC

That three speed would be GREAT as a 4spd. Easy swap with your resources as well. Easy Peasy.

GaryJ

I am not opposed to adding some money to my build to create a special engine if I could add ~100HP to the 5L Hybrid but I don't want to get into a position where I have the potential for another 100 HP but it would require daily or hourly tweaking to get to run properly. I would prefer a stable extra 50 than a tweaky 100 HP.

From what I am gathering so far my current CIS system caps out at 400 HP but there is a fix for that with the upgraded distributor and warm up regulator from 928 Motorsports currently tested to 480 and not breaking a sweat. My heads without some major work cap out in the mid 400's again fixable but probably pretty expensive, 4K or so just for the heads.

A 1L stroker would require CIS upgrade, head work, and of course the crank and other bottom end work. I think this would be a pretty expensive, the already mentioned 7500 for the crank, rods, and pistons, the head work to increase the flow probably 4K with new valves and alike, then the CIS upgrades. That’s getting to be a chunk of change to add to my build. Would this be a 450 HP car and would it be stable?

A purpose built 5L supercharger engine. This is probably the middle option it would require bottom end work but probably less than the stroker motor from a cost stand point, the super charger kit at about 6K, and the CIS upgrades. Probably a few thousand less than the stroker build but would this be a 450 HP car and would it be stable?

Build the 5L Hybrid as originally planned then come back and add a supercharger to it but at lower boost and with an IC. Probably my most cost effective option but would yield something closer to a 400 HP car I am guessing.

Do these assumptions look sound to you guys?

Thanks again for all your input.

Gary

PS the HP numbers are at the engine not RWHP.

BC

A stroker is not 7500 in parts. The crank is under 3k, and the rods can be about 1k to 1500 if you find the right situation. Then the pistons are easy, and under 1300 a set of 8 from JE. That would require NiCom for the block.

GaryJ

Brendan:

OK let’s say it is just 5 for the stroker part, 4 for the head work, and 1.5 for the CIS upgrade. Looking at the numbers Jim provided on the Devek 6L early stroker it yielded about 50HP increase and about 100 ft lbs. So say an additional 10K or so to the build to achieve the 50 and 100. does that sound correct to you? Would it be stable and is that a reasonable amount to spend for that level of increase.

Thanks,

Gary

John Veninger

Your right, its more!

Carl has a running 2V motor at 480hp? At what boost pressures?

In the end more HP= more money.

Why don't you work from your $$ and back into the HP to get the answer?

Jim Page

FWIW - JL's Euro @ 6psi put down 375ish rwhp. Carl is running a 5.0 with lower compression & higher boost.

BC

I agree, 10k sounds entirely unreasonable for a measly 50hp and 100lbft. For what Chevy guys can get for 3k with a cam, some headers, blah, blah, you know the story.

I'm not trying to pick it apart for you, or argue - please don't take it that way. If I gave Todd in Green Bay 10k, I would get a ****LOAD more then 50hp and 100lbft of power. Even on the 2V heads. The "Devek" stroker is an example of "boutique" prices. Jim uses that example because, IMO, thats what people do when they don't want to get thier hands dirty searching for better and more efficient ways to do things.

I may not be helping with comments. 2V heads are not rocket science, and 4k is outrageous for work on them to get flow. You know how people say that there is a "Porsche Tax" - you know, when you have to pay more because someone sees or has to work on or the part is for... a Porsche? I think there is an internet fee. Businesses who operate on the internet when it comes to cars seem to have an addtional amount that is required to get results.

GaryJ

John:

I don’t want to talk out of school but when I talked to Carl that is the understanding I had and that he was hoping to go beyond the 480 with new injectors. It is a purpose built 5.1L and I think he is aiming for something like 15 boost when it is all said and done. He did say this was just his experiment and he would not recommend this to a customer it is just a proving ground for him. For more specifics you need to ask Carl.

I am fine with more HP = More $ but I don’t want to be throwing money away. I would like to have a stable mid 400 HP engine (at the crank upper 300’s at the wheels). I am seeing what this will cost and decide if I am willing to part with the funds required. I don’t want to fixate on the cheapest way to get that power and be paying again and again down the road since it doesn’t run right.

The one thing I have learned is that it is not common to take the 2V engine past about 300 RWHP.

Thanks again,

Gary

GaryJ

Jim:

Is that 375 RWHP with a 10.5 CR engine?

Do you know how long he has been running?

That could be a workable option and I could do it in two steps.

Thanks,

Gary

GaryJ

Brendan:

No worries I haven't taken anything you have said as argumentative. I have appreciated your input and am continuing to learn as I move forward on this project.

Thanks,

Gary

BC

The lower cost custom pistons for 1000-1300 are a trade off because it requires 1500 worth of engine coating (nikasil bore). But then you are free to any custom forged AL piston maker there is. JE, Arias, etc.