Harland Sharp RR's...and Patriot cam..few q's..
12-16-2005, 03:31 AM
#1
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Harland Sharp RR's...and Patriot cam..few q's.. I have the Patriot 232/230 .580/.580 110lsa camshaft.
I also have the Patriot Gold dual valve spring kit along with Comp Cams Chrome Moly pushrods. (7.4") Im running the stock heads.
Now Chris Straub said that adding 1.8's on the intake side would yield me some more power with this cam. Keep 1.7's on the exhaust. (He's the guy that designed this cam for Patriot)
Just wondering if this would be a good upgrade to opt for the Harland Sharp roller rockers as Gunnar@Patriot said he could do me up a 1.7/1.8 mixed set for $379. Be nice to have a full roller setup and get some extra ponies at the same time.
Only thing im worried about is PTV clearance.
I also have the Patriot Gold dual valve spring kit along with Comp Cams Chrome Moly pushrods. (7.4") Im running the stock heads.
Now Chris Straub said that adding 1.8's on the intake side would yield me some more power with this cam. Keep 1.7's on the exhaust. (He's the guy that designed this cam for Patriot)
Just wondering if this would be a good upgrade to opt for the Harland Sharp roller rockers as Gunnar@Patriot said he could do me up a 1.7/1.8 mixed set for $379. Be nice to have a full roller setup and get some extra ponies at the same time.
Only thing im worried about is PTV clearance.
12-16-2005, 04:55 AM
#3
That's only going to run your intake lift to .614. That's not all that insane really, and I doubt you'll have a problem.
(Current lift/1.7) X 1.8 = .614
By the time the piston comes up to the end of the compression stroke, the intake valve has already been closed for quite a while. That's why he's saying to do it on the intake only. On the exhaust side things get quite a bit tighter.
(Current lift/1.7) X 1.8 = .614
By the time the piston comes up to the end of the compression stroke, the intake valve has already been closed for quite a while. That's why he's saying to do it on the intake only. On the exhaust side things get quite a bit tighter.
12-16-2005, 06:27 AM
#5
I honestly don't even think it will be close. Let's say his intake valve is closing at 52deg ABDC @ .050. (That's a little late for a cam of his duration and LSA - no way to know when it is for sure unless he's got the cam card or can give ICL). Anyway, add 20 degrees to that, and you see that the intake valve is completely closed at 72 deg ABDC. It still has a few inches left in the stroke (it's not even half way up yet). So the extra .034 lift is not going to be a problem. Now if he were to add 1.8's to the exhaust, that's another discussion entirely because by virtue of design the exhaust valve and the piston come much closer to each other than the intake does. See what I mean?
12-16-2005, 08:19 AM
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I do have a cam card.
Looking at the cam sheet...the specs it lists are...
.006 Tappet Lift
Valve Timing Open
AT INT: 34 BTOC 70 ABOC
EXT: 73 BBDC 29 ATBC
Specs for Installing at 109ICL.
INTAKE EXHAUST
Duration at .050 232 230
Lobe Lift .3476 .3430
Lobe Seperation 110
Looking at the cam sheet...the specs it lists are...
.006 Tappet Lift
Valve Timing Open
AT INT: 34 BTOC 70 ABOC
EXT: 73 BBDC 29 ATBC
Specs for Installing at 109ICL.
INTAKE EXHAUST
Duration at .050 232 230
Lobe Lift .3476 .3430
Lobe Seperation 110
Last edited by TheZaZ; 12-16-2005 at 08:32 AM.
