08-10 cfi 800 pistons compared to 2011 pro

[Old700]

Are the 800's in the new Pro the same block, pistons, head, etc as the older IQ Raws? As far as I knew the injection system was the only thing different, or are the piston to bore clearances on the 2011's tighter. I have an 09, put 1400 miles on the original motor with no problems, since the update, 3 complete topends and to finish last year off a 4th topend along with a crank. Since the update, I was only able to get 450 miles on last year with all the time it was in the shop. This year I am running a PCV but only have had it out for approx 100 miles. Is the real problem with the 08- 10 motors a fuel injection (mapping) problem, or a piston size problem? Or combined? What is the average piston to bore clearance on the 2011's?

 

[milehighassassin]

Hard to say if the monoblock cylinder is the same. They do have different part numbers:
Cylinder:
3022205-Pro
3022201-IQ

Piston:
Pro: 2204322
IQ: 2204154

Rods:
2203584 Pro and IQ

Crank 77105283 (pro and IQ)

Both do have 85 mm pistons

Both also use the same circ clips 22mm x 1.5
3021840


I would say it is safe to assume they are the same pistons. I would certainly measure them before trying to use them.

 

[volcano buster]

Both pistons have the same ring count?

Suppose one is mounted higher or lower for a change in porting?

 

[milehighassassin]

Both pistons have the same ring count?

Suppose one is mounted higher or lower for a change in porting?

Both are dual ring. not sure on location

 

[AKSNOWRIDER]

the cylinders are different, they have a lower port roof especially on the exhaust and the injector placement is different..pistons i am unsure of, heads are pretty much the same fuel system/electronics are different..crank is the same(as far as I know), cases are basically the same but the pro lacks the lower injectors...I would imagine the pistons will be the same...might have a longer skirt to help with piston issues ..I would bet you could run 11 pistons in the older motors but you would need to compare them and do some measurements...

 

[kvogt]

On the pistons, I heard the ring gap pins are in a different location. You would need to check that the ring ends don't go over a transfer port.

Kris Vogt

 

[sonday_2]

Sounds like a sled 09-10 can upgrade to a 2011..Probably by changing the main wiring,fuel rail, ecm, block and pistons..btw how cann you change the fuel pressure, is it in the ecm?