rebuild 2.7...or switch to a 3.0?

hl3891 · 05-11-2005, 11:04 PM

Hey all,

First time posting at this forum. I've been doing some research and also getting a lot of advice. I'm in the middle of deciding if I should rebuild my 2.7, which has been sitting for a year, or find a 3.0 sc engine instead. What is everyone's take on this? I've found that most people opt for the bigger engine. And thanks to everyone, I will not be dealing with MotorMeister (sorry to bring up the name, but everyone has saved me a looooot of trouble with them). Rebuild would cost me anywhere from 6k to 12k right? Whereas a 3.0 would cost me a little less and also maybe a warranty? I could also sell my old engine yeah? As I've posted on other forums, my budget is about 6-8k. Any advice would be greatly appreciated. Oh, I have a '74 911 and am located in the San Francisco area. Apologies if someone has posted a similar question somewhere else in the forums.

~H

Porsche_monkey · 05-12-2005, 04:14 AM

2.7 motors can be good?

cnavarro · 05-12-2005, 05:31 AM

A well built 2.7 upgraded to a 2.8 will give you excellent reliability if some steps are taken to prevent future problems. Case savers will help keep the studs where they should be (in the case). You can also have the case shuffle pinned, cryogenically treated, and put piston squirters if it doesn't have them already. I just had a customer in the same position as you who purcased a low mileage 3.0 SC engine that now too needs a complete overhaul, after spending a sizeable amount of money for the used 3.0. Long story short, I would just rebuild your 2.7 :-)

speedingbullitt · 05-12-2005, 08:25 AM

whats the cost, process and benefits of cryogenicaly treating the case?

Steve

cnavarro · 05-12-2005, 12:54 PM

Well usually a case can be done for $75 plus shipping, shipping usually being the expensive and difficult part. I've had Performance Cyrogenics (www.percyro.com) and 300 Below (www.300below.com) do this service my myself and customers in the past. To make a long story short, the cryoing process improves the grain structure which has many benefits from improved cooling and strength to longer life.

vance · 05-12-2005, 05:31 PM

hl3891:

I'm glad you got the story on Motor Meister. Unfortunately I had them rebuild my 2.7, as I wanted to keep the original engine. The 2.7 engine is lighter than the 3.0 so I understand the HP gain with the 3.0 is negligible. When I was trying to decide between the 2.7 and a 3.0 the concensus seemed to be with the 3.0.

If you don't mind I would like to forward your post on to Motor Meister. Just to let them know we're having some success driving business elsewhere.

hl3891 · 05-12-2005, 05:47 PM

of course you can send the post to MM. they need to know that they need to shape up and do quality work. its not fair to everyone they fool. its rare that anyone is completely happy with their work.

also, anyone have their 2.7 built to rs spec? if so, how do you like it?

74goldtarga · 05-13-2005, 08:39 PM

Just wanted to add that I am looking at the same question in about a year. I am inclined to have my 2.7 rebuilt with the case inserts for the head studs higher compression heads, and new cams (carrera?) My mechanic recommended (I think) a 2.9 kit. He also suggested keeping CIS but I am sort of interested in carbs although I have no knowledge or expertise. I am interested to hear what you decide to do.

afterburn 549 · 05-13-2005, 09:54 PM

imho go with a good injection system as it will not give you the fits carbs will....as time goes on carbs will look more and more stone age,there are lots of choices SDS or Electromotive (both of these will run double plugs) there are more venders,I dont know them all.....on the other hand depending what your doing there is nothing wrong with CIS either.

vance · 05-14-2005, 06:04 AM

74goldTarga:

Go to the tech articles here on Pelican. "Extracting Power from a CIS Rebuild" is an excellent article on increasing HP and maintaining the original CIS.