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Author
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Topic: 1.7 roller rockers
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Fastymz
Moderator Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 07-20-2004 05:26 PM
   
What would I get out of going to a full roller rocker thats a 1.7 ratio.I have now a 1.6 roller tip rocker with a 270h cam. Would I have to change my push rods too ? ------------------
SCOOP oddly obsessed with big scoops on little Mustangs 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics The older I get
The better I was
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Dubz
Gearhead Posts: 1890
From: Manitoba Canada
Registered: Oct 2002
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posted 07-20-2004 05:58 PM
well you'd get another 0.030" of lift at the valve, and i would think duration would increase slightly, as well as increasing overlap so your car would sound even nicer  i'm not sure what effect faster ramp speed has to do with performance, but that would be increased too as the valve will open and shut 6% faster (my math may be off a bit)as for pushrods i would guess it would depend on which set of rockers probably?? the 1.7 magnum roller tip ones i got used the same pushrod as the 1.6 though. [This message has been edited by Dubz (edited 07-20-2004).]
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Fastymz
Moderator Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 07-20-2004 06:02 PM
If I did change the rocker to a 1.7 ratio I'd go to a full roller rocker too.------------------
SCOOP oddly obsessed with big scoops on little Mustangs 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics The older I get
The better I was
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Dubz
Gearhead Posts: 1890
From: Manitoba Canada
Registered: Oct 2002
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posted 07-20-2004 06:40 PM
quote:
Originally posted by Fastymz:
If I did change the rocker to a 1.7 ratio I'd go to a full roller rocker too.
yah, that's why i said i wasn't sure of the pushrods, as you said you weren't going to be using what i did
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capri man
Gearhead Posts: 7249
From: doerun, ga.
Registered: Nov 2000
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posted 07-20-2004 08:09 PM
i think you can get more performance with a different cam for a lot less $$$$$$$.------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.33 @92mph 1/8
1.54 60 ft. http://www.angelfire.com/ny5/billswebsite/pg06.html
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Fastymz
Moderator Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 07-20-2004 08:15 PM
Thanks Mike, I know your right but I wouldn't have to open the motor with new rockers. Just thinking about future mods already  ------------------
SCOOP oddly obsessed with big scoops on little Mustangs 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics The older I get
The better I was
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capri man
Gearhead Posts: 7249
From: doerun, ga.
Registered: Nov 2000
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posted 07-20-2004 08:50 PM
what is your valve/piston clearance now?remember a 5.44 lift with a 1.6 will be a 5.78 lift with a 1.7 rocker, for examp;e.------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.33 @92mph 1/8
1.54 60 ft. http://www.angelfire.com/ny5/billswebsite/pg06.html [This message has been edited by capri man (edited 07-20-2004).]
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Fastymz
Moderator Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 07-20-2004 08:54 PM
quote:
Originally posted by capri man:
what is your valve/piston clearance now?
About this () much
I don't know off hand I need to check with the machine shop.  ------------------
SCOOP oddly obsessed with big scoops on little Mustangs 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics The older I get
The better I was
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steve'66
Gearhead Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 07-20-2004 08:57 PM
Ron,I'd work with your current combo and maximize your et first. Then look for more h.p. It's worked for me, the h.p. has been the easy part of the puzzle. SteveW p.s. I think the rockers are a waste of money that you won't see on a time slip. At least not yet.
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Fastymz
Moderator Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 07-20-2004 09:00 PM
Ok thanks guys, I'll go back to doing what it is I do best,,,,,,,,,,, now if only I knew what that is.  ------------------
SCOOP oddly obsessed with big scoops on little Mustangs 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics The older I get
The better I was
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capri man
Gearhead Posts: 7249
From: doerun, ga.
Registered: Nov 2000
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posted 07-20-2004 09:09 PM
errrr uhhhh, talking????  ------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.33 @92mph 1/8
1.54 60 ft. http://www.angelfire.com/ny5/billswebsite/pg06.html
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steve'66
Gearhead Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 07-20-2004 10:49 PM
quote:
Originally posted by capri man:
errrr uhhhh, talking????
Hey Hey Hey, My buddy does a lot of thinking while he's "talking". SteveW
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steve'66
Gearhead Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 07-20-2004 10:56 PM
Ron,I even did/am doing this on my other car. It's only 3 mph behind Mel's Mustang, but almost a second behind in et. I haven't even jetted the carb or done anything to the h.p. yet. I have a lot of work to do to get the power to the ground, before I bother adding more power. SteveW
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Bloose
Gearhead Posts: 755
From: Milwaukee, WI
Registered: Dec 2001
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posted 07-21-2004 12:37 AM
I went from 1.6 roller tip rockers to 1.7 full rollers on my 289 with a very simular cam. First off the roller tips were the type that you didn't need guide plates to use so stock push rods were fine with them. When I went to the 1.7's I used standard rollers not the conversion type that require no guide plates. So, I had to devise a way to run guide plates and get hardend push rods, which I did. I noticed very little gain (read no gain) going to the 1.7's. But I may have been maxed out on what the heads could flow. If your heads can flow more there is no reason why longer rockers shouldn't yield more power just like a cam with more lift and slightly more duration. But like I said I noticed no gain in ET. That being said, I also ran into a problem when I went to a bigger cam. I had a hard time finding a cam with a good amount of duration without getting nuts on the lift end of things because of the 1.7 rockers. If I had it to do over I'd have stayed with 1.6's, it would have made things much easier when I went to a bigger cam. HTH,
B-loose
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Fastymz
Moderator Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 07-21-2004 02:23 AM
Mike they say every one if good at something. Steve I hear what your saying, GET TRACTION FIRST !!!! I agree looking at tires ASAP. B-loose, what you said helped a lot and made good sense. I'll saty with what I have tune it and then see what or if I need more. Always want MORE ------------------
SCOOP oddly obsessed with big scoops on little Mustangs 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics The older I get
The better I was
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CHIPSBAD67
Gearhead Posts: 396
From: LOU,KY;USA
Registered: Sep 2003
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posted 07-22-2004 10:03 PM
the only reason i run roller rockers is to save my valve guides. i have never noticed any power gains between running stamped or roller rockers. im sure there is a gain, and im sure its like spitting in the ocean. on the ratio thing, i wouldnt do it. bloose is right. the only time i would is if i ran in a specific heads up class that called for a specific cam limit but allowed for higher rocker ratios.------------------
306, 4speed, 4.11's....best 1/8 mile 7.58 at 92mph with 1.72 60ft. PUMP GAS/NO ADDERS/STREET TIRES
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