There are guys like Peter, Neil, Fred, Henry, etc. who if they say the engine makes XXX, I wouldn't doubt them for a minute.

at what rpm is that 2.7L motor making 277 hp ??

was an engine dyno used? (the rear wheel hp suggests a road dyno, and they are not too accurate)

nothing against you or the builders (BTW skills not shills above) but it an unusually high number (unless direct injection and 4 valve heads are used on a modern motor)

Dynos are so subjective with all the correction factors involved. I recall Henry dynoed a MFI 2.7 at 223hp@6600 rpm. That was at the crank. Here.... http://forums.pelicanparts.com/911-engine-rebuilding-forum/765168-just-another-2-7-rs.html

Another Henry 2.7 build with OE air box and heat exchangers. 239hp on 91 octane. 215 ft lbs at 5500 rpm with 906 cams.

http://forums.pelicanparts.com/911-engine-rebuilding-forum/305185-what-these-guys-looking.html

Here’s 234 rwhp with GE60, 9.5 compression and single plug. Video included.

http://forums.pelicanparts.com/porsche-911-technical-forum/523418-screamn-2-7-dyno-pmo-itbs-pwr-efi.html

High horsepower 2.7 guy deleted his posts. Hope it wasn’t me posting somewhat basic but still well powered 2.7s on dyno or reported by Henry.

Obviously a no expense spared 2.7 is going to get close to his claim with high compression, high rpm, good fuel management, and all that combined with the right builder.

Why do people have to take everything so personal?

I dont want to fight about it, or most of all discredit the car, myself, or the Dawes. 11.3 compression, twin plug, 8300 redline, PMO EFI, etc etc etc, all done by Dawe. I dont have the dyno sheet and yes, I spared no expense whatsoever. Good night all!!

minoclan - enjoy the car

This one is approximated to be 234bhp at the crank actually. I know who tuned the engine. Fudged numbers. I think that engine would have made more power with a mod S cam though, not enough compression for a GE60/DC60. For anyone reading this in the future, without twin plugs and greater than 10:1 compression, I wouldn't ever go more than a mod S cam.

Head flow technology for 2v heads with 46-47mm valves hasn't changed much in the last 30 or so years. The factory RSR 2.8 head was special in that it used a 49mm valve, angled differently to fit the thing, with 43mm ports (!!). Getting 10-20bhp more than that factory 308bhp is somewhat possible these days, but not much beyond that, certainly not the 350bhp needed to crank out 287bhp at the wheels, all without the special factory RSR 2.8 heads with 49-50mm valves.


This full bananas 2.8SS build Henry just did won't make much more than 300bhp at the flywheel, and motors for the street don't get any more bananas than this beauty.

https://forums.pelicanparts.com/911-engine-rebuilding-forum/1043243-fun-supertec-2-8ss-build.html

Somebody here mentioned about losing weight. Absolutely, absolutely.

Our focus is about identifying the amount of performance we can influence in an engine. I believe in the engines ability to respond to throttle inputs. Our job is to provide an engine with performance without sacrificing the response. Lowering the component weight, reducing friction, lowering oil pressure, anything that claws back lost HP, just turning the engine over.

You can get only so much air into one of these engines, so managing what air you have to use, is what needs to be done. Once the air is in the port, how quickly you can use it, get rid of it, without the engine having to do more work than necessary. Once the air is in, it becomes a simple job to fuel it and ignite it.

What makes us "look really good"at what we do, is having to push a lighter car around. Nothing beats that. The car accelerates quicker, changes direction quicker, and stops quicker. Isn't that about what we want in a cars performance. The engines HP is just cream.

HP sells and unfortunately many places "really sell it". In the end, whatever an engine makes is less important than how happy the car owner is.

For a street engine, about the most power you're gonna get out of it is 1.4 lb ft torque/cu in. If it's an all out race engine, you can get it up to about 1.6 lb ft/cu in if you pull out all the stops.

If you do the math, that'll get you 239 lb ft of torque for a 2.8L engine. If you set it up for max power at 6500 rpm, that gives you 296 hp. FWIW.

Neil is right. Light weight works wonders.

Weight is what usually gives us 914 guys such an advantage. I can run a 3.2 in a 914 and be at 2200 with the power to weight ratio of a 964. Switch to glass bumpers and lids and some other inexpensive changes and I'm at 2K lbs. Fun stuff.

I ran into this thread and thought I would try to resurrect it as I am working on my 2.7 right now in a 1975S. I am looking at keeping my P&C but using a set of 40 Zeniths I have with 32mm venturis in them and SSI exhaust I have and looking at SC grind cams to give it a little life. The heads have 35mm ports which appear to be factory. I am just after a strong durable street engine as the car is an original narrow body that I want to keep that way. Thoughts?