• Welcome to the Contour Enthusiasts Group, the best resource for the Ford Contour and Mercury Mystique.

    You can register to join the community.

physical size differences between 3L and 2.5L?

S

Shmee

New CEG'er
Joined
Sep 27, 2001
Messages
5
Location
Van BC
So i've got a 2.5L SVT-C engine in my Focus and i have been thinking that a 3L swap might be in the cards soon.

issues i have thought of with the swap...

the 2.5L is absolutely shoe-horned into the focus engine bay. is there a difference on the overall physical size of the 3L vs the 2.5L? my main area of concern is the width of the engine where the valve covers meet the head as this seems to be the widest point and also where the tightest space restrictions are in my engine bay.

the engine in my car came with NO ECU decals of any sort so i have NO IDEA what the ECU code is. the engine is from a 99 SVT-C if that matters, is there a list of common ECu codes for 99 SVT-C's?

are there any issues that could cause me issues in such a tight engine bay??
 
if you do a ported 3L you can keep the outward appearance and size the same as your current engine...

there is a list of ECU codes I would suggest searching there are several for the 99 SVT is your car a return-less fuel system or return style? that should help nail it down a bit...
 
it's a return system.


ok so the block and heads are all the same overall size between the the 2.5 & 3L...
this is really important for me as a 1" difference means hacking away my rad support!
the contour/cougar/mystique engine bays are a LOT larger than the focus bay!

so then was the increase in displacement a matter of bore, stroke or bore&stroke?

how do the 3Ls take to revs?
is there anything from the SVT-C engine that is a worth while swappable part into the 3L from a performance aspect? Cams?

I've done some reading on the subject but it seems a lot of the info is spread pretty thin.
 
Shmee said:
so then was the increase in displacement a matter of bore, stroke or bore&stroke?
Click to expand...
3L bore is 89mm, 2.5L is 82.4mm. Stroke is the same on both engines @ 79.5mm.

Shmee said:
how do the 3Ls take to revs?
Click to expand...
These cams stop making power well before the rev limit, so very few people have bothered to wind it higher.

Shmee said:
is there anything from the SVT-C engine that is a worth while swappable part into the 3L from a performance aspect? Cams?
Click to expand...
This has been the ultimate debate. Some people will say no, others will say yes to the SVT cams and/or upper intake. One thing that's undisputed is that the SVT cams have a bit more duration.
 
are the heads hyrdo or solid buckets as my cam builder can always make something special for me if needed! :)

is there any aftermarket support for these engines?
rods, pistons, UDPs, adjustable cam gears, flywheels, etc?


also, are there any sources that actually still sell parts for these cars?
all the old sources seem to have packed it in or no longer really carry anything?


sorry lots of Noob questions!
 
Shmee said:
is there any aftermarket support for these engines?
rods, pistons, UDPs, adjustable cam gears, flywheels, etc?
Click to expand...

Yes. There are plenty here are a few below. Searching in here and the FI forum will help you a lot.

Pistons
- Diamond Racing Pistons
NPG has them-> http://www.nautilusperformance.com/catalog/i52.html
- Ross Racing Pistons

Rods
- K1 Technologies - 4340 billet H-beam rods - P/N: FH5440AGFB6 - $617.28 a set +shipping (~$15)
- Pauter Machine - 4340 chrome moly Billet Rods - Ford Duratec 2.5/3.0L - P/N: FOR-210-530-1380F - $1290.00 for a set of 6

ARP bolts:
- 253-4701 ARP Head Studs
- 253-5402 ARP Main stud kit

Upgraded Valve Springs from Mondeo ST220
- Ford P/N: 2S7Z-6513-AA, ST220 Valve Springs (measured 161-163 lb/in)

Flywheels
-Fidanza
-SPEC
 
You must log in or register to reply here.
Back
Top