What's the difference between these 2 cams
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From: Oregon
What's the difference between these 2 cams
What is the difference between these two cams? These are both Comp Cams:
Hyd valves -- 1800 to 5000 rpm ops range -- Grind 270HR -- Duration Advertized in. 270 ex. 270 -- @.050" In 215 ex. 215 -- valve lift w/1.5 rockers in. .500 ex. .500 -- lobe sep angle 110 degrees
Hyd valves -- 1200 to 5200 rpm ops range -- Grind XR264GR -- Duration Advertized in. 264 ex. 269 -- @.050 in. 212 ex. 218 -- valve lift w/1.5 rocker in. .488 ex. .495 --lobe sep angle 112 degrees
Which one of the two above should be put into a Vette engine?
Thanks in advance.
Hyd valves -- 1800 to 5000 rpm ops range -- Grind 270HR -- Duration Advertized in. 270 ex. 270 -- @.050" In 215 ex. 215 -- valve lift w/1.5 rockers in. .500 ex. .500 -- lobe sep angle 110 degrees
Hyd valves -- 1200 to 5200 rpm ops range -- Grind XR264GR -- Duration Advertized in. 264 ex. 269 -- @.050 in. 212 ex. 218 -- valve lift w/1.5 rocker in. .488 ex. .495 --lobe sep angle 112 degrees
Which one of the two above should be put into a Vette engine?
Thanks in advance.
Team Owner
Joined: Oct 2004
Posts: 81,241
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From: altered state
St. Jude Donor '05
If it had to be either of the two, use the 264HR.The wider lobe separation will be much more computer friendly; It's also a split pattern cam. U wouldn't us a single pattern cam unless you have an EXTREMELY efficient cylinder head and exhaust. It seems the 270HR is a version of their old school (carbureted)270 cam. If it was my choice on a TPI motor, try the 264. Just my opinion. Good luck in your quest. Ain't picking cams fun?
Le Mans Master
Joined: Jan 2003
Posts: 8,596
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From: Portland Oregon
Originally Posted by 884fun
What is the difference between these two cams? These are both Comp Cams:
Hyd valves -- 1800 to 5000 rpm ops range -- Grind 270HR -- Duration Advertized in. 270 ex. 270 -- @.050" In 215 ex. 215 -- valve lift w/1.5 rockers in. .500 ex. .500 -- lobe sep angle 110 degrees
Hyd valves -- 1200 to 5200 rpm ops range -- Grind XR264GR -- Duration Advertized in. 264 ex. 269 -- @.050 in. 212 ex. 218 -- valve lift w/1.5 rocker in. .488 ex. .495 --lobe sep angle 112 degrees
Which one of the two above should be put into a Vette engine?
Thanks in advance.
Hyd valves -- 1800 to 5000 rpm ops range -- Grind 270HR -- Duration Advertized in. 270 ex. 270 -- @.050" In 215 ex. 215 -- valve lift w/1.5 rockers in. .500 ex. .500 -- lobe sep angle 110 degrees
Hyd valves -- 1200 to 5200 rpm ops range -- Grind XR264GR -- Duration Advertized in. 264 ex. 269 -- @.050 in. 212 ex. 218 -- valve lift w/1.5 rocker in. .488 ex. .495 --lobe sep angle 112 degrees
Which one of the two above should be put into a Vette engine?
Thanks in advance.
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Joined: Dec 2001
Posts: 634
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From: Oregon
Originally Posted by cuisinartvette
If it had to be either of the two, use the 264HR.The wider lobe separation will be much more computer friendly; It's also a split pattern cam. U wouldn't us a single pattern cam unless you have an EXTREMELY efficient cylinder head and exhaust. It seems the 270HR is a version of their old school (carbureted)270 cam. If it was my choice on a TPI motor, try the 264. Just my opinion. Good luck in your quest. Ain't picking cams fun?
I feel a surge in the engine and now I know why.
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From: Oregon
Originally Posted by tjwong
Of your two choices the XR264 is the cam to go with. It very similar to the LPE/Accel 211 cam with 211/219 duration. But the LPE cam has more lift. If it was me I would be going with the 211/219 LPE cam instead of either of the cams that you mentioned above. In fact I found out the other day that LPE has the 211 cam on sale for about $245! Which is about a $100 off their regular price!
Team Owner
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From: SE NY
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For an '88 L98 XR264GR would be the better cam.
In addition I'd use 1.6:1 RRs with the correct single spring with damper. This will give you more lift with steeper open/close valve rates than the current cam but with less overlap for better low end torque as well as enhanced top end performance.
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Thread Starter
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Joined: Dec 2001
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From: Oregon
Originally Posted by 65Z01
For an '88 L98 XR264GR would be the better cam.
In addition I'd use 1.6:1 RRs with the correct single spring with damper. This will give you more lift with steeper open/close valve rates than the current cam but with less overlap for better low end torque as well as enhanced top end performance.
Team Owner
Joined: Oct 2004
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From: altered state
St. Jude Donor '05
Originally Posted by 884fun
Thanks for your reply. The 270 grind is in my engine. The 264 is the cam that Comp Cams says SHOULD be in my engine. I find this out after the work is done and after I get my tranny rebuilt.
I feel a surge in the engine and now I know why.
I feel a surge in the engine and now I know why.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Originally Posted by 884fun
Thanks for the explanation. I'm going to change this cam out. As for the RR's I have the stock OEM type. Those are going into the "spare parts" bin too. And I thought I had all of the bases covered....
