2.2E Mild Upgrade. Short stroke or long? Opinions Please!

[wagonboy]

I just received my very first issue of ESSES today - Ya-hoo! I'm excited to become more involved now that my new toy is nearly ready...
I'm new to the world of the 911 having purchased my first Porsche - a '70E - about a year and a half ago. Since then it's been undergoing a full disassembly/rebuild. The time has come to rebuild the engine. As the engine that came with the car is not a number's matching case but, is a complete 2.2E engine with MFI, I have decided to "upgrade" it a bit.
I'm torn between keeping the short stroke and boring it out to 90mm or change up the crank with a later 70.4mm and change up the pistons to maintain the stock "E" comp. I have an idea of what might be gained/lost with a longer stroke or larger bore so I'm mainly interested to hear what the community thinks of each (advantages/disadvantages), personal experiences or just your 2 cents worth on the matter if so inclined. Either way I go, I'm keeping the MFI. Perhaps some day I'll venture out for track days but for now it's going to be strictly street-only. Any comments or insights would be greatly appreciated.
Thank you in advance. Pictures will follow hopefully very soon.

[johntyboy]

Hi Marc

I too have a 1970 2.2E and a great car they are. I and my good friend Mike Bainbridge rebuilt my engine a couple of years ago. I went for a close to stock rebuild but with 2.2S pistons giving 9.8 : 1 compression ratio and S spec heads. This has given a great engine producing 177HP and 216 NM of torque. It drives really well, a number of other guys have had similar rebuilds and also find the engine great. This also has the benifit that you do not need to do too much with the MFI pump and distributor. A little more info can be found here.

http://www.ddk-online.com/phpBB2/vie...er=asc&start=0



Kind Regards

[CamBiscuit]

Marc - my 2c would be to keep the short stroke configuration. They have a fun revvy character that is not quite the same in the long stoke motors.

[fryardds]

Having owned a stock 2.2E in the past and now knowing what the possibilities are I would do a 2.5L SS engine with a non-matching case. That would be a blast.

OTOH you can't deny that a 2.7L RS spec wouldn't be a great choice either.

[JackG]

Marc,

I've got a 2.2 modified to a 2.5 short stroke in my 914-6 (for sale!) and it is great fun in any gear. I'm not sure how much hp it makes but it is very strong. I would highly recommend short stroke, regardless of any other mods.

[Curt Hammill]

I love my 2.5 ss twin plug. You can click on my 911E link and read about the engine modifications. I am still tuning the mfi after having it rebuilt to match the 2.5