1.7 roller rockers

[brent]

So did you get it up and running or are you still doing the install? I was just wondering if you still had the same impressions of the lack of low end and better high end now that they aren't bottoming out springs and what not. I have the yella terra 1.6's, and I was just wondering how the two compare. Maybe if you don't like them, I might want to pick yours up and try them on mine. My cam is .512 lift, i wonder what that would be at 1.7 ratio? Pretty big I'm sure.

head is at the machine shop getting the spring seats turned for the bigger spring diameter for the new springs, also waiting on new stem seals, and correct spring keepers and locks.


ditto what dyno said.

 

[Cjmartz2k]

Well, I have a Golen stroker that already has compcams springs with the seats machined down to fit, and I'm not sure, but I think that would probably cover the coil bind. It's a short rod stroker too, so I think it might have the piston vs valve clearance also. As for the rest about not enough flow, your probably right, and these would be a bad idea for me. Just a kicking around ideas. Maybe down the road if I can ever afford an aluminum head, these might work? I still probably wouldn't have the flow to justify these. Like I said, I was just throwing it out there. Thanks for the warning though guys!

Brent, the other question still stands. Did you like the 1.7's anymore after you got them installed properly with you new cam, or are they still to much? They look just like the 1.6's I got from Yella Terra. I think they are like you guy figured out earlier, made by Yella Terra.

EDIT: Brent, I just saw where you said the head is still at the shop. Let us know if you like the RR's anymore when you get everything together!

 

[Dingo509]

Well, I have a Golen stroker that already has compcams springs with the seats machined down to fit, and I'm not sure, but I think that would probably cover the coil bind. It's a short rod stroker too, so I think it might have the piston vs valve clearance also.

The way to make sure is to pull the head and put a wad of clay on the piston then reasemble the engine and turn it over once by hand, with the spark plugs out. Then pull the head off again and measure the indent left in the clay by the valve. this will give you a good idea of how much clearance you have, i personally wouldn't take this number to be set in stone but at least it gives you an idea.

Dingo

 

[5-90]

You're right - it isn't. I think you can reduce the operating clearance by .005" or so (to allow for the elasticity of the rods and bolts, and flex in the crankpin,) but you're going to get a very good idea from the "clay method."

One thing you might not have mentioned tho - once you spread the clay out on top of the piston, and you're getting ready to stick the head back on, make sure to lubricate the upper surface so it won't stick to the valves (might want to lightly lubricate the bottom as well, so it won't stick to the piston and give you inaccurate readings.)

Honing oil, WD-40, and other very light lubricants usually work very well. Have a head gasket on hand that is the same as what you plan to finally use, so you'll know the clearance with the compressed gasket.

5-90

 

[Dingo509]

yeah all that too. :laugh3:

Dingo

 

[brent]

Brent, the other question still stands. Did you like the 1.7's anymore after you got them installed properly with you new cam, or are they still to much? They look just like the 1.6's I got from Yella Terra. I think they are like you guy figured out earlier, made by Yella Terra.

EDIT: Brent, I just saw where you said the head is still at the shop. Let us know if you like the RR's anymore when you get everything together!

with the new cam they are great, idle is smooth unlike the RVOB cam, seat of the pants feel I've got good even power from off idle to top end, where the rvob was lacking the midrange, it was flat. and its even easier to chirp those 37's I'm running comming off the line.

 

[5-90]

went with one from clifford, 296 lift, 264 duration, same with intake and exhaust, gives me 503 valve lift with the 1.7 rockers, the cam I took out was a hesco RVOB cam.

Hey - you don't have a "grind card" for that RVOB cam, do you? I've been trying to get information out of HESCO for a while now (I need to write them again...)

5-90

 

[brent]

Hey - you don't have a "grind card" for that RVOB cam, do you? I've been trying to get information out of HESCO for a while now (I need to write them again...)

5-90

I wish I knew where I put it, can't find it.