Explain Flycutting to me
Explain Flycutting to me Mods are in my sig. Heads are: Patriot Performance Stage II Ls6 heads (2.02"/1.57"/59cc) I want to go to a bigger cam either a:
TSP 231/237 598/595 @112lsa or
TSP Torquer 2 232/234 .595/.598 @112lsa
Which one would give me more HP/TQ? Which cam is a more under the curve cam versus a peak power cam? I love the Comp224 i have now and wish to keep the nice fat, flat TQ curve that i have but just with a bigger cam.
I would like to know if i have to flycut for either cam to fit. I would like to hear from people what excatly it entails and if it is necessary. I just do not understand what it is for. I would rather ask a dumb question now, instead of having a 3300 lb paperweight after dropping a valve later. thanks.
TSP 231/237 598/595 @112lsa or
TSP Torquer 2 232/234 .595/.598 @112lsa
Which one would give me more HP/TQ? Which cam is a more under the curve cam versus a peak power cam? I love the Comp224 i have now and wish to keep the nice fat, flat TQ curve that i have but just with a bigger cam.
I would like to know if i have to flycut for either cam to fit. I would like to hear from people what excatly it entails and if it is necessary. I just do not understand what it is for. I would rather ask a dumb question now, instead of having a 3300 lb paperweight after dropping a valve later. thanks.
Last edited by SSwt00SS; Feb 27, 2007 at 09:45 AM.
both of those cams are designed to work without having to flycut. now that is assuming you have stock-like or unmilled heads.
if you mill the heads alot...say more than .030 you may have issues with the piston to valve clearance.
both of those cams will probably yield the same results...assuming typical varaiation from engine to engine.
if you mill the heads alot...say more than .030 you may have issues with the piston to valve clearance.
both of those cams will probably yield the same results...assuming typical varaiation from engine to engine.
thanks for the info guys.
teke...I bought the Patriot Performance Stage II Ls6 heads (2.02"/1.57"/59cc) assembled from them new. How do I tell if the heads have been milled over .030. Right now they are on the car exactly how i got them from P.P. thanks.
here is the link for them:
http://www.patriot-performance.com/w...05234&DID=1225
teke...I bought the Patriot Performance Stage II Ls6 heads (2.02"/1.57"/59cc) assembled from them new. How do I tell if the heads have been milled over .030. Right now they are on the car exactly how i got them from P.P. thanks.
here is the link for them:
http://www.patriot-performance.com/w...05234&DID=1225
Originally Posted by SSwt00SS
thanks for the info guys.
teke...I bought the Patriot Performance Stage II Ls6 heads (2.02"/1.57"/59cc) assembled from them new. How do I tell if the heads have been milled over .030. Right now they are on the car exactly how i got them from P.P. thanks.
here is the link for them:
http://www.patriot-performance.com/w...05234&DID=1225
teke...I bought the Patriot Performance Stage II Ls6 heads (2.02"/1.57"/59cc) assembled from them new. How do I tell if the heads have been milled over .030. Right now they are on the car exactly how i got them from P.P. thanks.
here is the link for them:
http://www.patriot-performance.com/w...05234&DID=1225
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Originally Posted by SSwt00SS
thanks, i should have posted up all the info in my 1st post to avoid the confusion i caused. i posted while still looking for the link :doh:
Originally Posted by SSwt00SS
TSP Torquer 2 232/234 .595/.598 @112lsa
thanks brad8266. i am glad that I have some people to finally give me some answers so i'm not in the dark. all the reading i did told me there was no reason to flycut. now i know why i need to in order to go with a bigger cam.
i guess my only question now is, i have a Comp 224/224 .581/.581 @112lsa now. am i having valve slap now w/this cam? i seem to have a lot more 'chatter' now since i put these heads on a month ago. i would be more than happy to take/post a video of what i am talking about. i was told i would have no issues with that cam so i went ahead and put the heads on. have i royally screwed myself?
i guess my only question now is, i have a Comp 224/224 .581/.581 @112lsa now. am i having valve slap now w/this cam? i seem to have a lot more 'chatter' now since i put these heads on a month ago. i would be more than happy to take/post a video of what i am talking about. i was told i would have no issues with that cam so i went ahead and put the heads on. have i royally screwed myself?
Your pushrods length can be causing this noise. Did you change the pushrods? What size pushrods do you have in there right now? What thickness head gaskets are you running? Since you have milled down heads and a cam it is harder to give you an idea of what size rod you need. Your best bet is to buy a pushrod checker from Thunder ($20) and actually measure the proper length that you need.
yeah, i swapped out the pushrods to Comp poly 7.4" PR's
as for the thickness i would need to call P.P. and ask, I don't remember the thickness off hand, used the gaskets that came with the heads...eerrr
i know what im doing when working on cars (i have worked on them for 12 years), but getting wrong info even after asking and getting pointed in the wrong direction by others is frustrating (not anyone here, i'm actaully getting help and advise here), but i talked to P.P. before getting the heads, etc and they said they would go right on, no problem, even after telling them all the mods done to the car...
as for the thickness i would need to call P.P. and ask, I don't remember the thickness off hand, used the gaskets that came with the heads...eerrr
i know what im doing when working on cars (i have worked on them for 12 years), but getting wrong info even after asking and getting pointed in the wrong direction by others is frustrating (not anyone here, i'm actaully getting help and advise here), but i talked to P.P. before getting the heads, etc and they said they would go right on, no problem, even after telling them all the mods done to the car...
Just flycut the pistons call it a day, especially because even if it clears without cutting, it wont be within the margin of safe clearences anyway. Look at my sig for my cam size/heads size and piston relief. Even with that it still was close.
something else to look into...
i've heard that patriot doesnn't mill their heads to acheive the lower chamber size. they weld up the stock chamber and re-machine them to make 59cc.
may want to look into this.
it's new info to me so i'm not sure exactly what all it entails.
but the extra chatter could still be pushrods...even if you put new ones in, they may not be correct.
i would suggest just test fitting the heads and checking for clearance...you may be pleasently surprised. you could also install a thicker gasket and gain some room.
i've heard that patriot doesnn't mill their heads to acheive the lower chamber size. they weld up the stock chamber and re-machine them to make 59cc.
may want to look into this.
it's new info to me so i'm not sure exactly what all it entails.
but the extra chatter could still be pushrods...even if you put new ones in, they may not be correct.
i would suggest just test fitting the heads and checking for clearance...you may be pleasently surprised. you could also install a thicker gasket and gain some room.
i called Patriot and the gasket thinkness is .052"
teke, you are correct, they do 'weld up' to make the 59cc chambers. i asked them if i had to flycut my pistons if i go with a Torquer v2 and was told that they have many customers with that cam and have no clearance issues, and i would not have to flycut. they do recommend that the 'ideal' clearance should be .040" from valve to piston.
if i flycut my pistons i will do as brad suggested and go .100", if it is necessary...
teke, you are correct, they do 'weld up' to make the 59cc chambers. i asked them if i had to flycut my pistons if i go with a Torquer v2 and was told that they have many customers with that cam and have no clearance issues, and i would not have to flycut. they do recommend that the 'ideal' clearance should be .040" from valve to piston.
if i flycut my pistons i will do as brad suggested and go .100", if it is necessary...
They recommend .040 PTV clearence? 
I have seen many references(not just random internet chatter) that recommends .080 intake/.100 exhaust PTV clearences for your typical street motor. .040 with stock block is way too tight IMO. i would not want my PTVC to be the amount of my spark plug gap, 
. I guess .040 works though, but its too close for my comfort.
I have seen many references(not just random internet chatter) that recommends .080 intake/.100 exhaust PTV clearences for your typical street motor. .040 with stock block is way too tight IMO. i would not want my PTVC to be the amount of my spark plug gap, . I guess .040 works though, but its too close for my comfort. Last edited by brad8266; Feb 27, 2007 at 12:10 PM.