2.02 vs 2.055 intake valve
06-02-2002, 10:03 PM
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2.02 vs 2.055 intake valve All else being equal, on a 346 ci motor, what is going to make more power from 6000-7200rpm? I can see how the larger valve might flow more. I can also see how the reduced shrouding of the smaller valve might work better at a high RPM.
So what's the criteria here for high RPM?
So what's the criteria here for high RPM?
06-02-2002, 10:13 PM
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Re: 2.02 vs 2.055 intake valve FWIW, my new high RPM solid roller motor still uses 2.02" intake valves, and it'll be turning a bit higher than 7200rpm...
If you're planning to buzz that stock shortblock of yours 7200rpm, I have a few pictures I need to send you <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
If you're planning to buzz that stock shortblock of yours 7200rpm, I have a few pictures I need to send you <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
06-02-2002, 10:15 PM
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Re: 2.02 vs 2.055 intake valve I've hit my 7200rpm rev limiter more than a few times. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> I really want to put those rod bolts in though. I have another motor on the way so I can afford to take a few risks. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
06-02-2002, 10:39 PM
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Re: 2.02 vs 2.055 intake valve Terry,
It's not the size of the valve, it's what meaningfull flow your porter can get out of either one of them at high lifts. Congrats on your 10 sec run BTW!
It's not the size of the valve, it's what meaningfull flow your porter can get out of either one of them at high lifts. Congrats on your 10 sec run BTW!
06-02-2002, 11:33 PM
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Re: 2.02 vs 2.055 intake valve I just had 2.055 x 1.60 valves put in (+ the appropriate porting/smoothing out behind seats, etc) vs, the old 2.02 x 1.57 (which were smoothed & ported to match the cylinders, etc) & all I picked up was 3 to 3.5% more flow.
2.055 vs 2.02 is 1.7% bigger, so I *guess* I came out ahead. The biggest difference (obviously) in my flow #'s was going from the stockers to the made by CNC Heads. Since then , the pickup has been incrementally smaller w/ each enlargement.
I would say the biggest criteria for high rpm hp isn't *just* the heads flowing more, it's obviously the cam having enough overlap (duration) to keep sucking wind past the valves.
2.055 vs 2.02 is 1.7% bigger, so I *guess* I came out ahead. The biggest difference (obviously) in my flow #'s was going from the stockers to the made by CNC Heads. Since then , the pickup has been incrementally smaller w/ each enlargement.
I would say the biggest criteria for high rpm hp isn't *just* the heads flowing more, it's obviously the cam having enough overlap (duration) to keep sucking wind past the valves.
06-03-2002, 01:37 PM
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Re: 2.02 vs 2.055 intake valve What about 2.00's? <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> I would go with the 2.02's. I think the little bit of flow you would gain with the larger valve would be more than offset with the added weight. Unless you're going with titanium then just get the 2.055's and use them with the 388. Focus more on the valve job than valve selection. There are alot of tricks to get some extra flow and lighten the valves up. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
MMS tried the 2.055's, how did they work?
MMS tried the 2.055's, how did they work?
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06-03-2002, 01:52 PM
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Re: 2.02 vs 2.055 intake valve The heads picked up on the flow bench but the car itself dynod on par with 229/2x 2.02 packages (~430rwhp). FWIW I don't believe anyone with a 346ci motor needs larger than 2.02 valves, but I am willing to reconsider my position if someone has had good results with a swap.
I'm going to order a pin on hood, and make some 12" extensions for the TTS headers, and order the DS2 front drag tires. That will save me 75# off the front end of the car pretty easily. Maybe enough to best 10.89? <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
So where can I find the LS6 intake valves and how much are they? I'll probably keep my current exhaust valves as they seem to be working fine. I'd like titan. 2.055 or 2.08 valves, but there is a long wait for them.
I'm going to order a pin on hood, and make some 12" extensions for the TTS headers, and order the DS2 front drag tires. That will save me 75# off the front end of the car pretty easily. Maybe enough to best 10.89? <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
So where can I find the LS6 intake valves and how much are they? I'll probably keep my current exhaust valves as they seem to be working fine. I'd like titan. 2.055 or 2.08 valves, but there is a long wait for them.
06-03-2002, 02:18 PM
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Re: 2.02 vs 2.055 intake valve Good luck finding 2002 LS6 valves. It's easier & cheaper to get the titanium jobbers. I'll check and see what the Titanium Ferrea's in 2.02/2.055 would cost me.
How light are the DS2's? I'm curious how they compare to the ET Fronts.
You might wait on the pin-on hood, unless your that anxious to pass my 10.89. I should have some good info. on a carbon fiber hood. Rumor has it it's 7lbs. I should be the first test dummy. I think I'll take my SS hood off and weigh it to see where I'm at now. If I ever get a break, I'll start on the carbon fiber t-tops. You need to run the car with the Burger Hatch and see what it does. Maybe I need that VFN Hatch to knock off another 75 lbs. 2950lb raceweight would be awesome. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
If I remember correctly, the !headlights saved around 15lbs. I'll weigh them today.
How light are the DS2's? I'm curious how they compare to the ET Fronts.
You might wait on the pin-on hood, unless your that anxious to pass my 10.89. I should have some good info. on a carbon fiber hood. Rumor has it it's 7lbs. I should be the first test dummy. I think I'll take my SS hood off and weigh it to see where I'm at now. If I ever get a break, I'll start on the carbon fiber t-tops. You need to run the car with the Burger Hatch and see what it does. Maybe I need that VFN Hatch to knock off another 75 lbs. 2950lb raceweight would be awesome. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
If I remember correctly, the !headlights saved around 15lbs. I'll weigh them today.
