Making a GMPP Hot-Chili-cam
#22
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Yes I think 218 is too small too but I still like the name. I say you do it and prove all of us wrong if it is truly what you believe will work! Then that way hot chili will be what all the noobs recommend from the outset when all of these what cam should I get threads come along!
#23
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how the f is he going to gain 20-30hp just from a change in cam lobes? have you not noticed the asa cam is consistently putting down 385-395whp...so you're saying that changing lobes will put you at or near 400whp? eehhh i'm not so sure. the cams work excellent as they are AND can utilize ls6 springs (as mentioned). i wouldn't put the additional abuse on the valvetrain for such a subjective gain in hp. i'd spend the $2-300 elsewhere, like an udp and tires or something.
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Yes I think 218 is too small too but I still like the name. I say you do it and prove all of us wrong if it is truly what you believe will work! Then that way hot chili will be what all the noobs recommend from the outset when all of these what cam should I get threads come along!
I really see no reason why faster ramp rates and high lift of something like XFI and XER lobes wouldn't make it a good thing into an even better thing?!
If these XFI/XER lobes DON'T provide AT LEAST 20hp gains or more power under the curve, then why does everyone bother with them? Doesn't make sense? If thats the case, why doesn't everyone just use XE lobes, there would be no advantage using anything else? See what I mean?
I would really like a PatrickG/PredatorZ type cam guru to comment or share their thoughts
If there are gains, i'll get this cam ground and share my results. Would make an awesome, modern, daily driver cam IMHO!
#25
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If these XFI/XER lobes DON'T provide AT LEAST 20hp gains or more power under the curve, then why does everyone bother with them? Doesn't make sense? If thats the case, why doesn't everyone just use XE lobes, there would be no advantage using anything else? See what I mean?
#26
Why don't you go somewhere in the middle of the Hot Cam and the bigger XFI type grinds? How about a 226° .571"/230° .575" XE cam? Pick a 109°-111° LSA and it will chop like no tomorrow, and it will not kill springs.
BTW, that is my cam listed and I have it on a 109° LSA +0°. It idles harder than either the Hot Cam or the ASA .
BTW, that is my cam listed and I have it on a 109° LSA +0°. It idles harder than either the Hot Cam or the ASA .
#29
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Hotcam is 219/228
XFI lobes jump from 218 to 224
So it had to be a 218/228 or a 224/228.
A 224/228 wouldn't resemble the original hotcam at all.
#30
#31
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This is what I think you should try:
224/224 .609/.581 111+1 LSA,
Degree that cam at those valve events, use PP duals and 7.425 pushrod
Properly tuned with bolt ons that cam will make 400+ cam only
224/224 .609/.581 111+1 LSA,
Degree that cam at those valve events, use PP duals and 7.425 pushrod
Properly tuned with bolt ons that cam will make 400+ cam only
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#36
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But i was just trying to say that he should bump up his intake duration since he was looking for another 20-30 horsepower over the hotcam and he did not really mention torque. I think a 228/228 would still give him plenty of rwtq but that is just me.
#37
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Well we know the hotcam itself does work. People have gotten some good results out of it with it's 9 degree intake/exhaust split and really low lift.
I really see no reason why faster ramp rates and high lift of something like XFI and XER lobes wouldn't make it a good thing into an even better thing?!
If these XFI/XER lobes DON'T provide AT LEAST 20hp gains or more power under the curve, then why does everyone bother with them? Doesn't make sense? If thats the case, why doesn't everyone just use XE lobes, there would be no advantage using anything else? See what I mean?
I would really like a PatrickG/PredatorZ type cam guru to comment or share their thoughts
If there are gains, i'll get this cam ground and share my results. Would make an awesome, modern, daily driver cam IMHO!
I really see no reason why faster ramp rates and high lift of something like XFI and XER lobes wouldn't make it a good thing into an even better thing?!
If these XFI/XER lobes DON'T provide AT LEAST 20hp gains or more power under the curve, then why does everyone bother with them? Doesn't make sense? If thats the case, why doesn't everyone just use XE lobes, there would be no advantage using anything else? See what I mean?
I would really like a PatrickG/PredatorZ type cam guru to comment or share their thoughts
If there are gains, i'll get this cam ground and share my results. Would make an awesome, modern, daily driver cam IMHO!
Example. Take a 1 inch diameter hose and push air through it at 40 psi for a minute. Now, take the same hose and flow 50 psi through it for the same amount of time. Obviously, the second example is going to flow a larger quantity of air.
Now, take a 3 inch diameter hose and flow 40 psi through it. It's obviously going to move more air than the 1 inch diameter hose at both PSI ratings. Then, take the same hose and flow 50 psi through it. That 3 inch hose with the 50 PSI is going to out flow everything you've tested so far.
Think of it as the larger the hose is the more air you have to push through it to reach that PSI rating. That increase is similar to the increase in cam duration. Increasing the duration allows you to flow more air into the cylinder because of the larger time / area of the hose it takes more air to reach the same PSI rating. The PSI rating is like the ramp rates. The faster traveling air is similar to going to a more aggresive lobe.
The thing is though that you can have something crazy like an LSK lobe on a 218 intake duration (I don't think LSks go that small, but example) and it will probably make more power than something on an XE lobe. The thing is that if you step that up to say a 225 XFI you'll probably make the same amount of power or more than the 218 LSK with less valve train wear. It's all a balancing act. Then, you have to throw in valve events, DCR calculations, and VE to the mix and it gets complicated real fast. Predator Z and Patrick G are the two who I'd talk to about this. Predator Z already gave you his opinion and I'd stick with that.
#38
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Predator-Z, I would love to discuss this with you a little more for my new car. PM coming.
#39
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Guys you are wasting your time with the GM "Hot Cam". Back in 98-00, we tried every way possible to get that cam to make power. It did alright, but nothing to write home about or waste a bunch of money trying to perfect.
Stick with the tried & true technology of today, and do not waste your money trying to pour syrup on a turd and call it a pancake.
Stick with the tried & true technology of today, and do not waste your money trying to pour syrup on a turd and call it a pancake.
#40
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Just letting everyone know what my xmas present will be
Comp Cams LSr cams (54-456-11):
219/227 .607/.614 112LSA
At least Comp thinks the idea had merit
Comp Cams LSr cams (54-456-11):
219/227 .607/.614 112LSA
At least Comp thinks the idea had merit