HP out of a twin plug 3.4L?
 

CORRECTION - it's a 3.2SS!!
I have a motor that was built up by a well known shop but i'm having trouble getting info on it so other than the obvious it's a guess for now. I keep getting the "how much HP?" questions, which I of course also have no clue about. I figure this engine has been built enough (in general) to have a range of what to expect (and i'm pretty sure, having said that, I will be wrong) to get some opinions. Here's what I think I know -

3.2L
Max Moritz 98mm pistons/cylinders
S Cams
40mm intakes
Twin plugged heads, polished and flow tested
Weber 46MM carbs
S cams
SSI's with B&B SS free-flow exhaust
Electromotive Crankfire ignition (no distrib)

This is it just out of the doner car-

http://forums.pelicanparts.com/uploa...1246888343.jpg

What CR?

10.5:1 (from what I am told.... )

What's a "mid-range" cam? Lotsa plug wires, so I'd assume 10.5:1 CR. What kind of ignition?

No idea, that's the description I got. As it supposedly is very streetable I would say it's somewhere between high-lift long duration and stock.. :D

Electromotive twin plug crankfire ignition.

I'm not looking for some sort of clairvoyant dyno here, just what ranges a well built 3.4 would put out, i.e 230-275, 210-250, etc. etc. I'll get it dyno'd when installed, i'm just curious and it seems to be the one question everyone asks.

300ish give or take. My 3.4 is similar, with bigger exhaust primaries and 48mm ITB's and EFI, made about 300-310hp at the flywheel.....

Cheers

Thank you Jeff, so I will assume 250ish and most likely be in the ballpark.

You exhaust might be a little restrictive, but I would have been very disappointed with 250. My stock euro 3.2 with headers and ITBs puts out ~265 fwhp.
I would also guess around 290-310.

I was kind of curious why he stayed with SSI's that dump into a 2" B&B maxflo muffler (with 3" outlets!).. guess that was the only heat option at the time. I'll post back once I get it on the dyno, be fun to know exactly what the RWHP number is..

OK, got a little more info to add if it matters.

Max Moritz 98mm Pistons and cylinders
S Cams
40mm intakes

Is it a 3.2 SS or a 3.4? Do you know what crank is in it? What about the case, does it have a sump cover?

Cheers

It's a 3.2SS, 3.0L crank, yes it has a sump cover (assume it's a machined 3.0L case?).

3.0L case + Max Moritz (98mm) = ss 3.2

Unless using 3.2 crank etc..

Well, if Dan Jacobs says it's a 3.4... it's a 3.4. He mentioned it was big $$ to build.
Didn't yet ask him about crank and rods.

Edit: He corrected that today, it's a 3.2SS... he apologizes for the misinformation.

The 74.4 crank drops right into the 3.0 case. The only reason I asked is that the MM 98's were common for 3.0 motors which did make them 3.2SS.

But anything is possible, today I corrected some issues on a 3.5 that the owner had built on a 3.0 case.

Cheers

Don't mean to hijack thread but wondering, Jeff Alton, if your car is still for sale. I PM'd and emailed a couple times but never got a response.

If still avail., please send me a PM or email to tlarocque@cox.net

Thanks.

Sorry I missed your contacts, I will email you tonight.

Hi-jack over, Gary, let me know if you need any comparo info...

Cheers

Thanks Jeff, I hope to have her mounted in her resting place in about two weeks and running so i'll see what happens after that. I race a 175HP stock 3.0L so I would think this motor should impress even though I did have a 300+ HP turbo a while ago...

Well, I guess I should say "If Dan Jacobs says it's a 3.2SS then it's a 3.2SS!!" He just got the word and apologized for the misinformation... me too!

So what HP can I expect out of a 3.2SS?
:D

I will be building a similar engine this winter. I believe the MM 98mm P&Cs measure at 9.8:1. Though I have heard there are higher compression MMs. With a mod S cam and twin plug I would be conservative at guessing 265 horsepower.

You are correct in that the new motor will give you a a very noticeable shove :eek:

Thanks Joe. I removed the carbs today to take the shroud off for refinishing and looked down the intakes into the head. Someone spent some serious time polishing down there! I pulled about a softball size of crap out from between the cylinders.. little nuts, twigs, big nuts, and assorted junk. Cylinder fins were gunked up from the mouse piss and both steel shrouds were rusted to bits. Luckily I have like-new ones from another motor that i'll bead blast/paint/reinstall. The fins cleaned up great with a wire brush and I was able to blow all the garbage out. Top of the oil cooler was half-plugged too but that seemed to blow out fine also.

Same basic setup only 3.4 with 10.5:1 pistons. I dynoed at 275 rear wheel. Given the slightly smaller displacement I would take a guess at 250 rear wheel. The short stroke should have different rev and torque properties however.

I have a motor/parts sitting on the stand as well with this config.. believe my pistons were 10.1 Though I have heard of some that are 10:5.1 as well.
I'll be running 46 MM TWM throttle boddies on mine.. still trying to decide on what cam. Car will be hot street/auto-cross/DE not dedicated track.

I have a 3.2SS that CC'd 10:1. Its twin plug with DC40-108 cams. I am running TWM itbs and EFI.

The car also has a short, close-ratio transmission and weighs about 2000#.

This motor is absolutely incredible compared with the stock 3.0. It feels like there is nearly as much torque around 2500 as the stock 3.0 but above 4K there is no comparison. It flat out hauls ass until 7200 when the rev limiter kicks in. You will love the engine combination.

I have not had the car on the dyno. Its on the list but too hot right now to subject the car to so much torture.

I had a motor almost exactly like this and LOVED it.

Are the heads early or late SC?

Gary R.. not trying to hijack your thread, that being said...

So Jamie, what size TWM w/what # injectors? Which EFI?

So you're really liking the DC40-108 cams huh? That's my area of head scratch at this point.. trying to determine which cam will work best for this set-up.

My heads are large port 78, twin-plug as well.

Thanks,

Paul

Sorry to hijack this , but I have a 3.4 built and I'm a little disappointed. I'm wondering on the jetting you folks are using.. Can you please provide me a 'base' line setting? I'm currently using 175 mains / 38 vents/ 155 air / 1 3/4 European / Monty twin / 35 degree advance ...suggestion?

I believe they are from a 78 originally but they are ported out to 40mm now (and twin plugged of course).

Horse power estimate
 

Gary

I have a similiar engine. Same pistons, webers and twin plugs. Mine has GE60 cams, larger primary headers and slightly larger ports. I believe I have about 275 HP-280 HP.

It really depends on your cams. The GE60 is more agressive than S cams. If they are S, my guess is your engine is in the 260 to 275 range.

I am very curious what size venturis you have. I just ordered new 38mm venturis. I was tempted to try 40's.

By the way, I am just up the road in Northampton Ma

Tom

Tom - I'm told they are 38mm venturis and they were used to give her a better midrange. The PO said she will pull like a train to redline, may get a little more top end out of 40's but mid-low range may suffer (according to him)..


Here she is about ready to go into the car, too bad the car isn't quite ready! I used all SS bolts for tin and nuts wherever possible.

http://forums.pelicanparts.com/uploa...1249424702.jpg

http://forums.pelicanparts.com/uploa...1249424721.jpg

http://forums.pelicanparts.com/uploa...1249424747.jpg