Has anybody independently flow tested the new AFR 210 or 227 Cylinder heads ? If yes, was it the standard port or competition ? And what did they flow ?
Its been forever since I heard from you !! How are you doing ? Still racing your 84 ?? Hope you are and hope you are finding the winners circle every now and then too !!
I have a set of AFR LT4 210' Eliminators (PN 1101) in competition port with 65cc chambers. I had them flowed when I got them (here's a cut-and paste from my original post in C4 tech):
As suggested earlier, I had him flow the AFRs as well as a new stock LT4 casting (with stock valves) that I had sitting around to get a good baseline for comparison.
My builder said that his numbers are generally lower across the board from what other flow benches run. You can see this when you look at the stock LT4 flow numbers versus some of the other sources I found. His numbers for the stock LT4 heads were anywhere from 5%-10% lower on the intake side and 3%-11% lower on the exhaust side than the numbers I found from Popular Hot Rodding.
They were 12%-17% lower on the intake side and 14%-17% lower on the exhaust side than Chevy High Performance's stock LT4 flow numbers.
Obviously if you look at the raw numbers, the results aren't too thrilling with a 286 peak on the intake side. However if you adjust for the fact that the baseline stock LT4 numbers we got were noticably lower than what other sources have reported, it looks much better. I played with various extrapolations, but not wanting to start a bench-racing discussion I'll leave that alone.
The biggest thing we were both surprised by, though was the fact that the AFR's intake ports flow dropped above .55" lift. This definitely contradicts the flow curve data on AFR's site which shows them continuing to rise (albeit slowly) to .7" lift. No clue why.
One other comment he had was that after looking closely at the oil drainback holes, he recommended not touching them. He was comfortable that they'd be more than adequate as-is.
I too have a new set of 210 Comp Port Elims for my car.
On our bench they went into port stall up over .600 lift also. I was quite shocked and almost started grinding the "SKI JUMP" beside the guide out of them as I had seen this very problem in some old 18 degree "restrictor plate" heads we had once upon a time. However after talking with some other engine builders, it turned out to be the radius entry plate we were NOT using (we clayed one since we didn't have one that would fit the LTX bolt pattern). I tried to modify our clay radius but it just didn't work very well. I modified a lexan radius plate to fit and it solved the problem. Don't even try to flow them with no radius...
I also bolted an LT4 intake manifold to the heads and (althou it killed the flow numbers a little) the port stall and turbulant air over .600 lift problem was gone as well.
The port desgin is very interesting to me as the CSA at the pushrod is very narrow for such a big port IMO. The "Ski Jump" is there to help with swirl as the air/fuel mix enters the combustion chamber. My bench is dry so I did not observe the swirl generated but the Eliminator heads definatly have a "different" sound when you open the valve on the bench compared to the old style 210's. After using some air speed probes in different locations in the port on mine I'm not sure I agree with how they did some things in the port - but different head porters seldom agree on anything.
For a fact every Flow bench is different. Numbers from one can't really be compared to advertised numbers except for the "curve". I can tell you the new 210 Elims are 15-20CFM at almost every lift better on my bench than the old 210's just as AFR's numbers indicate. Because of this I decided against changing anything on the port desgin to start with. The real test will be on the dyno and at the race track once the engine is in the car. If it performs it performes and I will have learned a little something. If it dosen't perform I'll pull them off and start changing things to the way I know works.
Will
Yea, I left the ports untouched also except that I had to trim a little off of the top of the intake ports to eliminate a 'step' between my ported LT4 intake and the AFR port.
I'm glad to hear that the intake eliminated the air turbulence problem -- I'm in the same boat as you know as I'm going to run them and see what happens.
I recently finished a motor using the 195 competition ported eliminators. My machinist also had a heck of a time with the heads stalling at anything over .55” of lift. I went so far as to purchase the same inlet flow guide that AFR uses. We never could match AFR’s numbers. All this time I was in contact with Tony Mamo at AFR. Tony had me send the heads back to AFR, he checked them, then called me (over the weekend) to discuss his results. He was seeing the heads over 300 CFM at .55” and .6”; at .6” they were just starting to stall. He sent the heads back to me (no shipping charge), we retested them and now were measuring near AFR’s numbers. We never solved the mystery, but Tony Mamo went out of his way to make good on these heads.
Our final flow numbers on the intakes were: .3”/207CFM, .4”/256 CFM, .5”/291 CFM, .55”/301 CFM, .6”/308 CFM
The motor is a 374 SBC (4.125” bore x 3.5” stroke), it went 540 peak HP on the dyno with a 237/243 at .050 cam. If interested, here’s the whole story on the motor:
They flow about as advertised. THe bench I normally used is closer to home and it usually reads about 10 cfm less+- than Tonys bench. 2sets of heads show about the same difference so Im sold. I havent felt the need to try a 3rd bench. I dont know if his inlet fixture is any different than others but it gets clayed in so its "right".
You wanna see some sick exhaust #s on the 210s throw a 1-7/8 pipe on when its on the bench. Tell me what you see because you wouldnt believe me if I told you
You wanna see some sick exhaust #s on the 210s throw a 1-7/8 pipe on when its on the bench. Tell me what you see because you wouldnt believe me if I told you
I´ve got a set of 210 RR Eliminators on my not yet started blower 381 and no flow bench so you can tell me...
Corvette Store
New AFR Eliminator cylinder heads....
