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Awesome crappy vid lol. That Z06 is a weapon for sure.
When all is said and done, there's been really quick cars with cathedral heads and with square port heads. I have no bias or preference on either heads as long as they work well.
Seems a little hard to believe that Nitto NT05's deadhook 1st gear at 650whp as they likely don't have much sidewall on that car....maybe it doesn't make much torque
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Kidding!!!
That car now run 8s with a 427ci with cathedrals naturally aspirated
Yeah i know his new engine combo ended up at 8.6's in the 1/4, still with cathedrals. Was it TEA (trickflow) 245 heads, from memory? something like that i think. He sure knew how to get the most out of the car too, as well as an engine combination.
Yeah i know his new engine combo ended up at 8.6's in the 1/4, still with cathedrals. Was it TEA (trickflow) 245 heads, from memory? something like that i think. He sure knew how to get the most out of the car too, as well as an engine combination.
TFS 245s by Greg Good. Car made 699 rwhp as well and wasn't no 2800lb car.
Seems a little hard to believe that Nitto NT05's deadhook 1st gear at 650whp as they likely don't have much sidewall on that car....maybe it doesn't make much torque
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Kidding!!!
You need a torque port for that.
Sorry to burst your bubble.
Seems a little hard to believe that Nitto NT05's deadhook 1st gear at 650whp as they likely don't have much sidewall on that car....maybe it doesn't make much torque
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Kidding!!!
I agree on the surprising dead hook.....I was not expecting that at all. They were the big 345 / 30 19's so they are of steam roller proportions and just to be clear its the NT05R we are discussing.....the softer compound version of the NT05 and I run them on my supercharged 2nd Gen V so I can tell you first hand they do stick amazing for a tire that drives essentially "normal".
Also.....and this is a big also.....it was the middle of the summer and 100 degrees most of the day......the sun had just dropped and we took that little ride around 8PM. I'm fairly certain the road surface still had alot of heat in it and he had driven a good ways to get to me so the tires were warm also.
I was fully expecting to be peddling the throttle and was very much caught off guard by the instant g-force and explosiveness of first gear.....in the brief time I had to process that I realized I better be pulling the lever for 2nd gear NOW
I agree.....they were the big 345 / 30 19's so they are of steam roller proportions and just to be clear its the NT05R we are discussing.....the softer compound version of the NT05 and I run them on my supercharged 2nd Gen V so I can tell you first hand they do stick amazing for a tire that drives essentially "normal".
Also.....and this is a big also.....it was the middle of the summer and 100 degrees most of the day......the sun had just dropped and we took that little ride around 8PM. I'm fairly certain the road surface still had alot of heat in it and he had driven a good ways to get to me so the tires were warm also.
I was fully expecting to be peddling the throttle and was very much caught off guard by the instant g-force and explosiveness of first gear.....in the brief time I had to process that I realized I better be pulling the lever for 2nd gear NOW
As an estimate ~2.65 sq in MCSA working backward from runner volume and length, but I think in actuality probably a little bigger by 5-10%. Probably more like 2.75-2.85.
As an estimate ~2.65 sq in MCSA working backward from runner volume and length, but I think in actuality probably a little bigger by 5-10%. Probably more like 2.75-2.85.
The AFR 245 head has a MCSA of 2.680 so they are very close.
I wonder why Trickflow haven't listed it on their spec sheet.
I guessed a little bigger because a 4.155x4" engine with peak power at 7000 rpm requires a 2.75-2.8 sq in MCSA from the basic calculator. The TFS says min bore size of 4.155 which seems weird to me. I bet you could fit them on a much smaller bore. Maybe they machine the chamber big.
Also a 2.1" valve size with MCSA set at 90% valve size is ~2.8 sq in.
MCSA of a port is not commonly shared. Head mfgs and porters blame consumers for only looking at flow bench numbers, but only provide port volume and flow bench numbers to go off of. They could really do a lot better job educating.
I guessed a little bigger because a 4.155x4" engine with peak power at 7000 rpm requires a 2.75-2.8 sq in MCSA from the basic calculator. The TFS says min bore size of 4.155 which seems weird to me. I bet you could fit them on a much smaller bore. Maybe they machine the chamber big.
Also a 2.1" valve size with MCSA set at 90% valve size is ~2.8 sq in.
MCSA of a port is not commonly shared. Head mfgs and porters blame consumers for only looking at flow bench numbers, but only provide port volume and flow bench numbers to go off of. They could really do a lot better job educating.
I found it odd also.
My guess is that maybe these heads work optimum on that bore size.
The AFR head is recommended on at least a 4.125 bore size but when they tested it they used a 4.155 bore plate.
Both heads fit on 4 inch bores but they most certainly would not be optimum.
Brian Tooley did mention in some of the old threads on here that these heads are good to spin up to 7000rpm.
Suits the fast intakes with their 6500rpm peak power rpm with a 7000rpm shift point.
I found it odd also.
My guess is that maybe these heads work optimum on that bore size.
The AFR head is recommended on at least a 4.125 bore size but when they tested it they used a 4.155 bore plate.
Both heads fit on 4 inch bores but they most certainly would not be optimum.
Brian Tooley did mention in some of the old threads on here that these heads are good to spin up to 7000rpm.
Suits the fast intakes with their 6500rpm peak power rpm with a 7000rpm shift point.
The 245s were actually recommended to me by Tooley my rod/piston 6.0 nitrous motor combo with a super vic on top. Probably wouldn't be optimal on a small NA street motor though.
A real Cathedral vs Rectangle port test! No Bottle necks so let's see how it goes...Hint 🤫 cathedral loss, Tq also, vs the larger port which Supposedly hurts velocity. Figure when you place a a bottle neck on things it Helps the smaller port Cathedral.
LMAO 😂🤣
go read and look @ the link. Bottle neck saves the Cathedral. When we can get the air and flow there cathedral is dead on Site. LMAO!
10-21-2020, 05:51 AM
