1.6 & 1.7 Roller Rocker differences? - Ford Mustang Forum
 
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post #1 of 13 (permalink) Old 09-21-2004 Thread Starter
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1.6 & 1.7 Roller Rocker differences?

I bought a set of crane roller rockers from a guy on ebay that said they were 1.6 but when I tried to get a little info on them, the number on the rockers wouldn't come up anywhere. I talked to the tech guy at summit and although they had crane cams imbossed on them he claimed they weren't a crane rocker. The number was not a crane number. I figured that seeing as they were a few years old (but never used) that the numbers were different. So I sent the guy a pic of them and he said that they were made by crane for ford to go on the 93 cobra and also that they are 1.7 instead of 1.6 like the guy claimed they were. hence, watch what you buy on ebay. this guy apparently didn't know what he had. Not to mention I had no contact from him for 8 days, and then it took another week and a half to get them. crap, rambling. anyway, whats the difference lift wise between the 2. the cam I'm going with is 500 lift w/1.6 rockers. Also if anyone has any info on these rockers(#F3ZE-6529-AB) let me know. thanks a bunch.
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post #2 of 13 (permalink) Old 09-22-2004
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The 1.6 moves the valve a distance that equals the lift measurement of the
cam, times 1.6. So the 1.7 opens it a little bit farther. Better use some
clay, if noone can confirm for sure that they will work with your cam, heads
and pistons.

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post #3 of 13 (permalink) Old 09-22-2004
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Take the lift of your cam, divide that by 1.6, and multiply the result by 1.7.

Yeah, and get some clay!

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post #4 of 13 (permalink) Old 09-22-2004
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.500" lift is valve lift (w/ 1.6:1 rocker arm ratio)

.500 / 1.6 = .3125

.3125" is lobe lift (regardless of rocker arm ratio)

.3125 x 1.7 = .53125

.53125" is valve lift (w/ 1.7:1 rocker arm ratio)

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post #5 of 13 (permalink) Old 09-23-2004
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Hey, I learned something!

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post #6 of 13 (permalink) Old 09-23-2004
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whats the clay for btw?

go baby go.... gone...stock 5.0 short block gt 40x303 heads crane cobra 1.7 roller rockers ported lower intake kenne bell supercharger 70 mm edelbrock throttle body kenne bell 80 mm mass air with switch chip calibrated to 30 lb ford racing fuel injectors with bbk 190 lph fuel pump kenne bell ram air kit with a K&N filter MSD 6 al btm ignition with boost control bbk shortie headers bbk off road H-pipe with new o2 sensors flowmaster 3 chamber cat back exhaust maximum motorsportschassis/suspension
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post #7 of 13 (permalink) Old 09-23-2004
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The clay goes between the valve and piston. The impression made at TDC
is your clearance. It's worth checking, because the clearance is slightly
less at say, 7000 RPM if I'm not mistaken.

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post #8 of 13 (permalink) Old 07-20-2010
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I run 1.7 Crane non adjustable roller rockers on gtX heads with a .512 cam. I like it except for the fact push rod length has to be adjusted not the rockers. PITA to setup. The extra lift helps with the smaller valve size in my case.

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post #9 of 13 (permalink) Old 07-21-2010
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Do the clay! put a small amount inbetween the head and piston torque everything down to spec (put some oil on the valves so the clay doesnt stick) pull back apart and check for clearance.
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most times PTV clearance has nothing to do with peak lift

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can any one help me with this

i have an 89 coupe lx with 47000 orig mile and iam looking to get the cam sound out of the stock cam with out opening the motor up i was told that all i have to do is put 1.7 roller rocker on it and it will give me that sound will it work and do i have to worry about valve to piston clearents so if any one cane help that would be great thanks the geeman.......
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won't do it.
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I put 1.7 rockers in a 300 six, as it is a cheap power adder for that engine.
The down side is the power band moved up the tack and it lacks smooth cruise at low rpm.

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