1.7 crane rockers with E303 on 302 stock pistons any issues?

1993lxnotch · May 12th, 2009, 09:49 PM

I have 1.6 roller rockers on there now but am getting a set of lightly used 1.7 cranes from a buddy. Will there be any issue botling these on in place of the 1.6 with the e303 cam. Learning as i go here....first real mustang! Older mustang was a v6.....alot different. I know i might have to take off the underside of the valve covers or buy new ones for clearance. Any troubles you guys can think of.....is it worth it to change from 1.6 to 1.7 both roller rockers. Will i notice a difference. thanks for the input

93mustank · May 12th, 2009, 10:21 PM

What springs are you running? Whats is your coil bind clearance minus peak lift minus installed height?

Mlx50man · May 12th, 2009, 10:32 PM

Originally Posted by 93mustank

What springs are you running? Whats is your coil bind clearance minus peak lift minus installed height?

what he said, but piston clearence wise i know alot of guys running stock heads and stock pistons with the e303 and 1.7 rollers that have no problems.

M L Struck · May 12th, 2009, 10:36 PM

I have set that up twice with no problems.You will be fine

1slo5.0 · May 12th, 2009, 11:21 PM

Originally Posted by 93mustank

What springs are you running? Whats is your coil bind clearance minus peak lift minus installed height?

+1

Valve to piston clearance shouldn't be an issue but coil bind and/or valve float might be. Probably not worth it in this case.

blue90lx · May 13th, 2009, 12:07 PM

The crane 1.7s will give you a 30thousands more lift. So the e-cam has .498 lift when you add the 1.7s it will give you a .528 lift no issues with clearance just might want to get some different valve springs

JBIGBOOTSY · May 13th, 2009, 01:00 PM

.542 is the end of the line for safe PTV with stock stuff. But its ALLWAYS recomended to check

93hatch · May 13th, 2009, 01:00 PM

Originally Posted by blue90lx

The crane 1.7s will give you a 30thousands more lift. So the e-cam has .498 lift when you add the 1.7s it will give you a .528 lift no issues with clearance just might want to get some different valve springs

isnt e cam 510 lift on both sides?

JBIGBOOTSY · May 13th, 2009, 01:13 PM

Originally Posted by 93hatch

isnt e cam 510 lift on both sides?

no. not unless the lobes are really dirty.

1slo5.0 · May 13th, 2009, 02:01 PM

Originally Posted by blue90lx

The crane 1.7s will give you a 30thousands more lift. So the e-cam has .498 lift when you add the 1.7s it will give you a .528 lift no issues with clearance just might want to get some different valve springs

Lift at the valve is relative to lobe lift. Rocker ratio just multiplies it. While a 1.7 rocker might give .030 on one cam, it will be different on other cams. On the E cam it will be .529 or .031 more lift.

E cam:
.498 / 1.6 = .31125 lobe lift
.31125 x 1.7 = .529 lift at the valve

Trick Flow 51420001
.542 / 1.6 = .33875 intake lobe lift
.33875 x 1.7 = .576 intake valve lift

.563 / 1.6 = .351875 exhaust lobe lift
.351875 x 1.7 = .598 exhaust valve lift

1slo5.0 · May 13th, 2009, 02:02 PM

Originally Posted by JBIGBOOTSY

.542 is the end of the line for safe PTV with stock stuff. But its ALLWAYS recomended to check

Depending on the valve timing of the cam and factory machining tolerances. Valve timing can play a bigger role than the actual valve lift.

1993lxnotch · May 13th, 2009, 03:48 PM

thanks for all the responses guys.

88-gt-t-top · May 13th, 2009, 07:28 PM

Originally Posted by 1slo5.0

Depending on the valve timing of the cam and factory machining tolerances. Valve timing can play a bigger role than the actual valve lift.

Care to educate, lmao?
Also, when did the name change happen, I just noticed that.

93mustank · May 14th, 2009, 01:38 AM

Originally Posted by JBIGBOOTSY

.542 is the end of the line for safe PTV with stock stuff. But its ALLWAYS recomended to check

What a horrible statement..........

JBIGBOOTSY · May 14th, 2009, 02:56 AM

Originally Posted by 93mustank

What a horrible statement..........

Straight from FMS svo catalog from 1995. As the thread topic is about rocker ratio, which has nothing to do with duration.

93mustank · May 14th, 2009, 10:30 AM

Stop reading magazines sir

1slo5.0 · May 14th, 2009, 01:45 PM

Originally Posted by 88-gt-t-top

Care to educate, lmao?
Also, when did the name change happen, I just noticed that.

When the valves open and close.

Couple days ago.....finally.

May 12th, 2009, 09:49 PM	#1
1993lxnotch Newbie 1993 Mustang lx coupe Join Date: May 2009 Location: Davie FL Posts: 41 iTrader: 0 reviews	1.7 crane rockers with E303 on 302 stock pistons any issues? I have 1.6 roller rockers on there now but am getting a set of lightly used 1.7 cranes from a buddy. Will there be any issue botling these on in place of the 1.6 with the e303 cam. Learning as i go here....first real mustang! Older mustang was a v6.....alot different. I know i might have to take off the underside of the valve covers or buy new ones for clearance. Any troubles you guys can think of.....is it worth it to change from 1.6 to 1.7 both roller rockers. Will i notice a difference. thanks for the input

May 12th, 2009, 10:21 PM	#2
93mustank Banned Join Date: Aug 2008 Location: Phoenix,AZ Posts: 3,014 iTrader: 1 reviews	What springs are you running? Whats is your coil bind clearance minus peak lift minus installed height? __________________ PeteAndersonRacing.com

May 13th, 2009, 12:07 PM	#6
blue90lx Regular 90 lx hatch 12.83@105 Join Date: Mar 2008 Location: Albertville, Alabama Posts: 157 iTrader: 0 reviews	The crane 1.7s will give you a 30thousands more lift. So the e-cam has .498 lift when you add the 1.7s it will give you a .528 lift no issues with clearance just might want to get some different valve springs __________________ to many parts and money to be so slow

May 13th, 2009, 01:00 PM	#7
JBIGBOOTSY MM Fanatic 1990 LX hatch Join Date: Aug 2006 Location: Hobart Indiana Posts: 4,391 iTrader: 0 reviews	.542 is the end of the line for safe PTV with stock stuff. But its ALLWAYS recomended to check __________________ Bolt-on Abraham Lincoln Log motor. With extra wiring.

May 14th, 2009, 10:30 AM	#16
93mustank Banned Join Date: Aug 2008 Location: Phoenix,AZ Posts: 3,014 iTrader: 1 reviews	Stop reading magazines sir __________________ PeteAndersonRacing.com

May 12th, 2009, 10:36 PM	#4
M L Struck Hardcore Enthusiast 85 GT/86 SVO/2010 GT500 Join Date: Oct 2008 Location: Rossville IN Posts: 1,183 iTrader: 0 reviews	I have set that up twice with no problems.You will be fine

May 13th, 2009, 03:48 PM	#12
1993lxnotch Newbie 1993 Mustang lx coupe Join Date: May 2009 Location: Davie FL Posts: 41 iTrader: 0 reviews	thanks for all the responses guys.

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