'89 2.7 VS S2 block
#5
Rennlist Member
#7
Addict
Rennlist Member
Rennlist Small
Business Sponsor
Rennlist Member
Rennlist Small
Business Sponsor
As far as attachment point the S2 block is identical to the 2.5 block, the S2 oil pans have the turbo drain hole (with a threaded plug). For what you want the S2 block is a better choice – its stronger and, most importantly, it has the windage holes. I believe that the holes make it a much superior design for a track engine.
The only thing that you will need to deal with is different head studs – you will need the head studs from a 2.7 if you want to run a 8v head.
The only thing that you will need to deal with is different head studs – you will need the head studs from a 2.7 if you want to run a 8v head.
Trending Topics
#9
Addict
Rennlist Member
Rennlist Small
Business Sponsor
Rennlist Member
Rennlist Small
Business Sponsor
The block 'floor' is higher than the 2.5 so the free standing cylinders are held in place better. The windage holes are large holes above the crank that allow air to move between cylinders 1&2 and 3&4. Remember that all the air being moved as the piston goes down has to go somewhere, as piston 1 goes down piston 2 is going up so the volume of air has to move through the crank case from cylinder 1 to cylinder 2 – and it has to do that at 200 times per second at 6krpm. That’s a lot of air moving back and forth. In the 2.5 block the air has to pass under the crank and girdle – right by the oil on the oil pan. That’s a lot of air moving around and it will move the oil around too.
The S2 block has the windage holes located so the windage can move back and forth above the crank – away from the oil!
The S2 block has the windage holes located so the windage can move back and forth above the crank – away from the oil!
#10
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
Chris, Going to have to arm wrestle you on this one. All 104mm blocks has the windage ports. 2.7L, S2 and 968. We don't feel there is any difference in the S2 or 2.7L blocks strength wise as the are both 104mm bore and have the same cylinder webbing, at least visually. The girdles however are different on the two. The girdle on the S2 has more clearance for the rods (larger stroke crank). The 2.7 block is more or less like a S2 block with a 2.5L girdle on it. So clearance is required doing a 3.0 crank in the 2.7 depending on connecting rod being used.
We do the windage port modifications on the 2.5L blocks for reasons you mentioned for a modest $325. Customers report a quicker revving engine. We do it for that, and crank oiling purposes.
We do the windage port modifications on the 2.5L blocks for reasons you mentioned for a modest $325. Customers report a quicker revving engine. We do it for that, and crank oiling purposes.
__________________
Mike or Dave Lindsey
www.lindseyracing.com
U.S. 1-877-943-3565
Other 1-405-947-0137
Mike or Dave Lindsey
www.lindseyracing.com
U.S. 1-877-943-3565
Other 1-405-947-0137
#11
Addict
Rennlist Member
Rennlist Small
Business Sponsor
Rennlist Member
Rennlist Small
Business Sponsor
Well I was working out my Bicep ready for a good match...and then I reread the thread title - I thought it said S2 vs 2.5...duh. S2 and 2.7 are the same block...exactly the same, just with different head studs.
I just read the titles closer…
BTW - thats a good price on the 2.5 mod - that is a real pain in the butt job.
I just read the titles closer…
BTW - thats a good price on the 2.5 mod - that is a real pain in the butt job.
#14
RL Community Team
Rennlist Member
Rennlist Member
The oil pan on the 2.7 is different than the S2. The S2 metal baffle (on the shallow part of the pan) has more clearance for the larger stroke.
#15
Rennlist Member
Chris, Going to have to arm wrestle you on this one. All 104mm blocks has the windage ports. 2.7L, S2 and 968. We don't feel there is any difference in the S2 or 2.7L blocks strength wise as the are both 104mm bore and have the same cylinder webbing, at least visually. The girdles however are different on the two. The girdle on the S2 has more clearance for the rods (larger stroke crank). The 2.7 block is more or less like a S2 block with a 2.5L girdle on it. So clearance is required doing a 3.0 crank in the 2.7 depending on connecting rod being used.
We do the windage port modifications on the 2.5L blocks for reasons you mentioned for a modest $325. Customers report a quicker revving engine. We do it for that, and crank oiling purposes.
We do the windage port modifications on the 2.5L blocks for reasons you mentioned for a modest $325. Customers report a quicker revving engine. We do it for that, and crank oiling purposes.