If you had a Cayman, what engine would you build?
 

Let’s forget about crate GT3 engine because this thread is about building.

If you had a Cayman minus engine/transmission, what n/a engine would you build for track use? (no smog rules)

well your in the water cooled engines i guess.

so you want to start with the gt (1-2-3) engine block, and i believe it can be pushed out to a total of 4L, theres no reason (unless it is then too weak) no to do that.

toss on some nice ITB's, proably 50mm, with a sequential injection controller. (i think I would avoid varioram and such)

add some side pipes so that they don't go sideways at all, just striaght towards the cloest edge of the vehicle.

would be a beast... nice ot think about...

Not necessarily water-cooled. I'd like hear air-cooled ideas too.

How about a short stroke aircooled engine with horizontal fan?

I would basically dissassemble the car and replace the needed parts leaving the unnessesary parts off. a 4 cam carrera 356 engine or the short stroke with a flat fan would give the car an old 904 feel. i would think the AC, water cooling parts, interior/trunk trim and bumper hardware would cut at least 400lbs off the total weight.

why on earth would you want to or even consider sticking an old air cooled motor into a cayman? just go buy yourself some 904kit car and stick your air cooled motor into that. I really do not understand why you would take a modern car and then backdate it in terms of technology with an air cooled motor.

edit. as far as a 4.0l engine goes I believe only cargraphic has done that. All the DP Porsche motors are 3.8litres and make scary power. Brumos ran a bastard 3.9l engine but it never worked properly.

Just add two turbos and watch the competition cry foul.

Anyway there is no reason why a properly built watercooled race engine can't make close to 600hp in race trim. I doubt you will see that though because most Cayman/Boxster owners can't/won't afford the development work. If there was a race class that allowed full development of the Cayman engine series then you may see more cool stuff coming out .

I looked into a Cayman for GT3 in ALMS or Grand AM, but right now there is not enough interest. Plus no one wants to hear the budget cost to show up for the first race.

Twin turbo water boxer would make way more than 600hp. I would tell you what the unrestricted DP motors make but I cant. For reference a DP motor is a 3.8 litre RSR with no restrictors, the RSR's run two 29.2mm restrictors and make a healthy bunch. If you were to turbo any water boxer the numbers would be awesome. Jurgen Alzen is running a 3.8 litre twin turbo and a chopped 997 at Nardo to try and break 400km/h. The motor in said car makes over 1000bhp built by RS tuning. Stuff one in a Cayman and have fun. I have yet to see a forced induction Cayman but it would be interesting. Who cares though as Porsche wont race it. I would tell you all other secrets about Caymans being prepped for racing but I cannot. Just wait and see what some shops come up with.

Sorry, I meant an NA motor should make well over 600. Yeah I agree turbos should get you well over 1000hp in race trim. When you turbo these engines though we will find the flaws in a hurry. I have to wonder how much less durable the wet sump engines are.

What!! 600hp from a NA, you must be kidding, right?? :confused:

I do not want a 904. For me, the Cayman is the best looking car in the world. I'm not biased on means of cooling.

Sorry not to have said how much power I'm looking for. Around 350 hp with 'getting-on-the-cam' characteristic.

If you "only" want 350 you put a 911S 3.8 litre motor in and call it a day.

Or if you have some juice to spend call up Manthey or Alzen and have them put a GT3 engine in.

I dont know what dyno's some ppl are using but what NA 6 cylinder porsche engine makes well over 600bhp?

Not even in your dreams!!!Candy.

If a pushrod two valve 5.7litre engine can make 850HP in race trim, you better believe I can get 600HP out of an unrestricted, NA Porsche engine. Will it be cheap? NO. I figure it would be somewhere in the area of 60K to get it done. Yes it would last more than 10secs.

:D

this car is an old Supercup, we rebodied with factory turbo bodywork so everything would fit nicely.

We then turned the 4 cam wasserpumper into a twin turbo engine managed with Haltech E11.

700hp, 700 pound feet of torque.

There is quite a bit more left in the engine. We have tuned conservatively (relatively) in order to help out the owners pocketbook lest he get overzealous.

http://www.rudtnersracing.com/newgene.php

I have yet to see those numbers on a NA 911 engine, well maybe in some future dream!!SmileWavy

I've yet to see a NA 911 engine fully developed.

actually, i'm kinda in the same league as turboteener here...

350's in nextal cup or w/e are making up to 800hp... from 5.7L carbed, pushrod, 2 valve, engine.....

porsche's endurence car (rs spyder) is making good power ot of its 4.3L, according to the race anncouncers alot more then they admit to.

but i'm far from and expert, expected another 20hp outta mine....lol..

cheers

I have one of those inefficient Ford engines in my Mustang. Let's see, just two valves, yet 2.25"/1.88". Sure you say big and heavy and I'll grant you that....but with a roller cam, I'm still shifting at 7600rpm and can run it out till 8200 in top. With a stroke of 4.25" and 8000 rpm, I've got F1 engines of yesteryear covered for peak piston speed.

Power is air flow and no matter how exotic, it basically comes down to cubic inches x rpm x volumetric efficiency.

The NASCAR boys are way over 100% VE so I'm not sure you can say simply that 4 valved boxster engines of some 30% smaller cc's are going to out produce. Unless your suggesting the Porsches are going to rev 30% higher which would put you at about 13k revs. Now were starting to talk F1 of only the late 90's and a little out of sportsman racing budgets.

I'm going to wait for the 600hp NA Porsche engine in the 3.8 range. Just my .02 so I'm siding with Candelaria and Porschekid962 on this one. I'm certainly not doubting the brilliance of Porsche engines...just physics.

I have seen Honda street engines making 140 percent VE at peak HP and Peak Torque. I assure you I can make that number with a Porsche race engine. The 2005 Porsche Leman engine was making 460HP with the restrictors in place. They were running it out to less than 9K. I would spin the engine to close to 10-10.5K and it could easily make 600hp. Plus with no restrictors the engine wouldn't have any trouble making that HP level.

Luke until you understand the physics please don't tell me it can't be done. The Six will loose some power in comparison without the extra two cylinders, but the extra friction would probably eat up the difference for the V8.

The average weekend warrior wouldn't afford one Winston Cup motor, one Pro Stock engine, one ALMS engine, etc. That doesn't mean that kind of power level is not possible. The reason no one has made the power is because people keep telling them it can't be done and there is no race organization that would let it run.

I would bet most of you guys believe 320HP is good from a 3.2 litre aircooled engine.

i did not say that the engine wasn't a vary capable engine, and i did not say that the flat-6 would make more power then the nextal cup engines or w/e.... i said it would make 600, not the 800 those engines are making...

your reply was big time angry, and only because you read my response as angry...

however, i am also a muscle car guy, i have a 69 chev step side with a ladder frame rear suspension, cammed up 327 making something like 300rwhp, turbo 400 with external cooler, .383 rear end, solo suspension....and this summer i am building a 500hp (forcheap if anyone here is a hotrod reader) 383 for it.

but... with that said, if the older tech engines can make more then 120hp/L (expecially when the used to make 30-40hp/L) then i also believe that one of porsches advanced tech engines can also.... this is logic not physics...

both of which i am qualifed to talk about.