would this be a gain? the other thing is i'm not sure if the crane spring kit will work with the xfi cam. i have the springs setup to 150-160lbs. on the seat.

 

What is the installed height on the crane springs and I'm guessing they are the 99893 springs.

The XFI cam lobes were designed to work with the 918 beehives so you get the best results and most RPM with them.

Bret

 

yes 99893. they were setup at 1.800.

 

They're not at 150-160 now on the seat once you've run them.

Bret

 

they have a 1000 miles on them. so yes they are 155lbs. i work at a machine shop and set them up yesterday. also the motor is rebuilt and sitting on the stand. it's decked .002 in the hole .030 over and all the other goodies.

 

Thats higher than I would expect.

Plus not to mention 99% of the time guys dont know the installed height OR the seated pressure, so forgive me.

Bret

 

bret do you think the xfi 218-224 will work with this spring? also i was thinking the GM846.

 

So you said that cuz you didn't expect them to hold pressure, or cuz some don't have a clue what pressure they have?

 

Because they dont have a clue what pressure or height they are installed at.

The GM846 is tamer than the XFI cam so it's definately going to work. The XFI cam is pushing it the most.

Bret

 

bret the big thing that worries me is the dcr. if i'm right the 218xfi will make the dcr high?

 

What your running now (227) would make the DCR higher if I remember the cam specs right.

Whats the static on the motor now?

Bret

 

yes the 227 now. the comp. should be 11.45. the 227 closes at 67.0.

 

the XFI is around 8.7:1 DCR

The 227 is 9.01

The GM 845 is 8.8:1

The XFI is the best bet in terms of power, but as always a custom could do even better.

Bret

 

Hey Bret - any ideas as far as valve spring life with the XFI(or similar custom) and 918's?

 

I put them to the test worse than those lobes.

Merry Christmas!

Bret