2.8 in a 2.2

[raspy2point2]

Anybody have a idea if I could make a 2.8 250hp engine work in a 1970 or 71 car? Could the tranny be modified to take the power? Or should I install this engine in a 2.4 car only. Regards Chris Early S reg#205

[rick2]

IVS has a 2.8 in his 69 with a 901.

[kenikh]

RSwannabe has a 2.8SS w/ 901 in his '69.

[Alan.uk]

Hi Chris,

Nothing wrong with fitting a motor like that in a 70/71. My own car is a 71 with a SS 3.2 with almost 300 bhp, running narrow body but with later 915 box.



It normally runs 6 and 7 inch (7Rs on the rear) but on the track with its track wheels/tires its lots of fun.




The next car we have in mind is also a 2.8 built around a 66mm crank and that is destined for a race prepped 72 car.

What spec were you thinking?

Thanks

Alan

[raspy2point2]

Thanks Alan-- I now have a 1970 911S 2.2 which I love and plan on leaving alone. But want to build a sports purpose hot rod 911. Being a member of the Aluminum Lug Nut Club, I am keen of weight saving measures even for the street. With high horsepower in mind I just took for granted I would be putting this 250 hp engine in a 72 or 73 car with the 915 tranny. But the added weight of the 915 and the notchy character of shifting--might not make me happy. As far as the engine spec; so far: 7R case 70.4 crank, still not sure to go MFI or PMO 40 or 46mm. Leaning toward carbs for weight and sport exhaust. Any Ideas for cams? Already have Mahle 92mm P&C modern style. Twin plug 10.5 : 1 ratio. Would like to safely go to 7500 or 7700 rpm ,so mabe some custom valve springs and light connecting rods. the base engine is a long block 73.5 CIS 911T engine. Regards Chris Early S Reg.#205

[karlusmagnus]

But want to build a sports purpose hot rod 911 ...... Being a member of the Aluminum Lug Nut Club, I am keen of weight saving measures even for the street ........ putting this 250 hp engine in a 72 or 73 car with the 915 tranny ...... But the added weight of the 915 and the notchy character of shifting--might not make me happy.

Chris, i think that putting in a 2.8 will give you more power than you will probably need, and that you will be happy. I would not worry about added 915 weight. With such an engine, I don't think it will be an issue. As for notchy shifting, if you are putting in a good-as-new (properly rebuilt) 915, i think you will be surprised as to how well it shifts. The notchy comes after wear and abuse. Care needs to be taken as it is not a japanese box, but you can wevo-ize it to such an extent that notchiness will not be a factor.
Best of luck with your choices ... sounds like a cool project.
Karl.

[RSwannabe]

As Kenik mentions above, I have a 2.8SS in my '69 911. I run it through a 901 tranny and would not have it any other way. I much prefer the 901 tranny to the 915 for shift pattern and feel. No question a 915 will be more durable, but after after almost 10,000 miles of hard driving with my 250 plus HP motor I have not had a single issue with my 901 tranny being able to handle it. Just remember not to stomp on the throttle
in first gear and the 901 should be fine.

[andyjboy]

I also had a 1970 911T with a 2.8 twin-plug motor (~255bhp) mated to the original 911 dogleg gearbox - no problems.

[MarkS]

If the 911 T/A is in good shape you won't have a problem with stomping the throttle in first gear. Drag race ' rev and drop the clutch' starts will kill it though.