How to build 2.7 for more pwr

[flmont]

Iam considering doing a 75' 2.7 Ltr in a 914,..but I want HP/TQ from that eng,..without going to crazy,..what cams are needed,.Iam sure carbs are where the pwr is so what would be the best set-up,..looking for reliable but a strong runner,..with lots O torque,..??? Thanks FM

[pemz0r]

I am running a driveable hot 2.7 in my '66 912 and it flies

2.7 Shuffle Pinned, by pass, upgrades, etc
40 Webers
9.5 to 1 JE Pistons
E CAM! (all low end, with a short geared 902 tranny)
Single Plug
The dizzy has a custom vaccum line that pulls through the manifolds
SSI
M and K exhaust

Front mounted oil cooler.

If you are heading to the Orange County area, I will definitely give ya ride in it.

[Flat6pac]

About 3 years ago I built a hot rod for a guy.
Started with a straight 74 case, bypass, case savers, 92mm JEs @9.5, solex cams, already had basic PMO so called for the needed mods, SSIs.
Great, fun, light weight car with very responsive acceleration.
Bruce

[al lkosmal]

https://www.youtube.com/watch?v=EWB99lddFew

regards
al

[Dltjaden]

I am in the same position. I just purchased a 1974 2.7L engine complete with the CIS fuel injection for eventual installation in my 1973 914. I currently have a 2056cc type IV in the car that I rebuilt with a web-cam and Megasquirt engine management. I really like the diveability and tunability of the MS FI and ignition control compared to the dual IDF Webers the car had when I bought the car. Because of that my thoughts for the 2.7 are:

- the engine already has case savers installed for all of the head studs
- a "top end" rebuild was done a short time before the 2.7 was replaced by the original owner by a 3.2
- I will am planning a complete tear down of the engine to check all clearances re-seal the case.
- on the rebuild, assuming I have Mahle nikisil cylinders, I will replace the pistons with JE 9.5 cr pistons and the cam with a 964 re grind.
- exhaust headers and a free flowing muffler

This combo was identified by Wayne D. in his rebuilding book as being compatible with the CIS FI system while providing a nice horsepower boost. Optomistically hoping for a 30-50 hp gain for a total of 180-200 hp with good midrange torque and excellent diveability.

[flmont]

I haven't been involved in 911 engine work since,.oh 2006,..when I did a top end on a 3.0,..but I did not have to split the case,..Iam sure a 3. anything is out of my price range now,..but with a 2.7 can they be rebuilt affordably or should ya hold out and pay way more for a 3 ltr ??? Thanks FM

[Mick_D]

rebuilds usually cost about the same on a 2.7 as they do on a 3.0 I am finding.

[Steve@Rennsport]

Originally Posted by Mick_D

rebuilds usually cost about the same on a 2.7 as they do on a 3.0 I am finding.

Not even close if its done properly.

The difference is case preparation and IMHO, that's not optional if you wish to have a reliable engine. Expect to spend anywhere from $2K to $3K (over a 3.0 litre), depending on precisely what is done.

[Mick_D]

If by case preparation you mean the installation of case savers and center-boring, does that really add up to $3k?

[tharbert]

Originally Posted by Mick_D

If by case preparation you mean the installation of case savers and center-boring, does that really add up to $3k?

It's certainly over $2k especially if you include the crank and rod work: case halves decked and align bored, spigots leveled, case savers in mains web long bolt and head studs, squirters cleaned, oil bypass and sourcing a 4 rib mag pump if needed, dipped and cleaned...and then there's the race mods if so desired.

[Steve@Rennsport]

Originally Posted by tharbert

It's certainly over $2k especially if you include the crank and rod work: case halves decked and align bored, spigots leveled, case savers in mains web long bolt and head studs, squirters cleaned, oil bypass and sourcing a 4 rib mag pump if needed, dipped and cleaned...and then there's the race mods if so desired.

Absolutely accurate right here.

[Mick_D]

Originally Posted by tharbert

It's certainly over $2k especially if you include the crank and rod work: case halves decked and align bored, spigots leveled, case savers in mains web long bolt and head studs, squirters cleaned, oil bypass and sourcing a 4 rib mag pump if needed, dipped and cleaned...and then there's the race mods if so desired.

And none of that ever needs to be done on a 3.0?

[Steve@Rennsport]

Originally Posted by Mick_D

And none of that ever needs to be done on a 3.0?

VERY VERY rarely, unless its a high RPM, high BHP race engine making 105-110 HP/litre.

[flmont]

Yea,..the 2.7 is a soft case and they tweek,..3.0 strong Alum.rarely need it but I know a 3.0 is to much for me now wasn't then paid 2500 for a complete 81',..I may go LS1...you could almost do the complete conversion for 4 K,..I kinda don't want to,..but 300 ponies in a 914,..???

[Jack Stands]

Check Henry Schmidt's Supertec website and he lists some prices. Not cheap, but you get what you pay for.

I have one of his engines in my 914-6 conversion, and it's an absolute blast to drive (~200hp at the rear wheels - S cams, Weber carbs, RS P&Cs).

Case prep is probably the most important part of the whole project, so do your homework.

[Dpmulvan]

Buy a 3.0

[JmuRiz]

Re: 2.7 budget rebuild...what kind of hp is available w/o head work?

I have a '74 2.7 that was previously rebuilt (has oil fed tensioners, 930 valve covers etc) but I'm told it was a stock-ish rebuild for a '77 car. It was a low mile rebuild as the PO went the 3.6 route rather than build the 2.7 to more power to fit a PCA class.

If the heads are stock-spec, would it make sense to have them redone and improved or keep them as-is and just do a p/c and cam swap?

Would I need to do case work if the case looks good? Just wondering what I'm getting into before tearing it down....or sell it and look for a 3.0?

Thanks for your input.

[Hcarraro]

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