4agze 4afe head.

[mega4a]

Yea I have to agree with the others, you ask what's best, we tell you, then you argue with us, what's the point?

In a turbo motor CFM is king, and without spending the money on the FE head you are wasting your time.

I must say Barry, that posting up the Blacktop flows at .500" is a misleading. You will struggle get that much lift in a blacktop head.
You will find that real world flow is around 185-190 CFM and .350"
and a properly ported FE will piss on that, but again if you don't do the work then it is pointless.

As for refering to F1 engines, you mad? You think the a pleb spec road car head from the same era is going to compare? Ask anyone that actually knows a thing or two and the answer will always be try and make the most power with the least boost.

haha i understand sorry i just got an augmentative personality =]

[touge_ae101]

haha i understand sorry i just got an augmentative personality =]

oh noes. well i guess TS is the place for you then. maybe you should pop into the smartphones thread and have a get together with cogent and a few other of the passionate nerds in there...haha

/flame away

[Dell'Orto]

I just say go for, if you've got the FE head there, mash it on the GZE bottom end go for it. Lots to be said for doing something different, even if the results arent as awesome as other cars.

[XSVWGN]

Im looking forward to the numbers put out by what you want to achieve. Make sure you start a project thread so we can all see what you are up to. Maybe us guys with high horsepower BT 4agtes may learn a thing or two from you ...


Matt

[Bazda]

Rookie, the lift taken at the inlet was not 0.500" for the blacktop but was 0.500" for the small port, I just wrote it like that cos its easier for people to comprehend.

The lift was taken on the intake at 0.350" and 0.400" on the exhaust for the blacktop head with stock cams. And that was the flow figures, so i dont know what you mean about the real world, this was the 'real world' reading using Lynn Rodgers Flow bench.

These results backed up also on Kelfords flow bench which read exactly the same! with in 2CFM difference.

A properly ported 20v head will piss on the fe head
I had one in the works and the gains we had got were insane. Even Lynn him self like all others were saying ohh cant do much with the 20v head they already flow well (he was actually thinking of the silvertop head), until he started attacking a 20v BT head I gave him.

We had the exhaust flowing 175CFM with the stock cams with no porting work! I will be giving this head back to him later this year to finish 1 cylinder off.

[~SlideWays~]

Rookie, the lift taken at the inlet was not 0.500" for the blacktop but was 0.500" for the small port, I just wrote it like that cos its easier for people to comprehend.

The lift was taken on the intake at 0.350" and 0.400" on the exhaust for the blacktop head with stock cams. And that was the flow figures, so i dont know what you mean about the real world, this was the 'real world' reading using Lynn Rodgers Flow bench.

These results backed up also on Kelfords flow bench which read exactly the same! with in 2CFM difference.

A properly ported 20v head will piss on the fe head
I had one in the works and the gains we had got were insane. Even Lynn him self like all others were saying ohh cant do much with the 20v head they already flow well (he was actually thinking of the silvertop head), until he started attacking a 20v BT head I gave him.

We had the exhaust flowing 175CFM with the stock cams with no porting work! I will be giving this head back to him later this year to finish 1 cylinder off.

Is 500hp not enough?

[Bazda]

Rookie, the lift taken at the inlet was not 0.500" for the blacktop but was 0.500" for the small port, I just wrote it like that cos its easier for people to comprehend.

The lift was taken on the intake at 0.350" and 0.400" on the exhaust for the blacktop head with stock cams. And that was the flow figures, so i dont know what you mean about the real world, this was the 'real world' reading using Lynn Rodgers Flow bench.

These results backed up also on Kelfords flow bench which read exactly the same! with in 2CFM difference.

A properly ported 20v head will piss on the fe head
I had one in the works and the gains we had got were insane. Even Lynn him self like all others were saying ohh cant do much with the 20v head they already flow well (he was actually thinking of the silvertop head), until he started attacking a 20v BT head I gave him.

We had the exhaust flowing 175CFM with the stock cams with no porting work! I will be giving this head back to him later this year to finish 1 cylinder off.

Is 500hp not enough?

I stopped work on it cos I didnt need the extra power and I wasnt doing any more drags + it will cost around $5k to build the head up to the spec I was intending. But i'm still interested to see what we can get from the head in terms of flow etc.
Maybe one day i can finish it off and get the same power on say for example 12psi as I did on 20psi.

[tsoob]

just do it man, that way we can say I told you so when your wrong

[allencr]

Ohh, I just feel so sorry for all those poor misguided souls with their futile 7AGE combos, little did they know!! Please!

[mega4a]

picked up ae101 4agze today 500 buks mean! newer gze piston are not dished but i have an older set of 4agze rods and pistons there dished and have bigger rods so that would mean lower compression right? wheres your magic calculator at?

so im gonna run ae101 gze bottom end (oil squirter's removed older pistons dont have the cut out them) older gze pistons and rods 4afe head sounds interesting =]

[Bazda]

the older style 4agze pistons I found are not as strong as the later model ones. ie they cant take much detonation before they blow to bits.

You can cut a hole out of the piston skirt to clear the squirters. Its only a semi circle that needs to be taken out. Either get a machinist to do it or die grinder.

[gasman]

just run the newer pistons, a less pissing about.

i ran them along with a blacktop head and a 0.8mm gasket, which would had bumped the compression.

4afe head would be fine

[mega4a]

just run the newer pistons, a less pissing about.

i ran them along with a blacktop head and a 0.8mm gasket, which would had bumped the compression.

4afe head would be fine

with the newer pistons the compression would be quite high with the fe head? i could run thicker head gasket

[Bazda]

thicker gasket means less squish between piston and head

[Rookie]

Sorry Barry, It was just the way that I read it that the flow has been corrected to .500" so that is where my real world remark came from, as they don't actuallty have .500" lift. The reason I thought so was because the numbers I have seen for a BT were around the 185-190 mark at .350" like this:

Flowed at 28" on an 81mm bore with the stock valve springs binding.

The thing is with 20v you get a lot of shrouding from the other vavles, which is pretty detremental to a NA motor because it makes them flow a lot less than they should for the valve area. The FE head will reliably make a load more power than a BT head NA beacause of the ability to run much larger cams because of the big cam buckets, In a FE head you can run .500" lift and I have seen numbers of over 300 cfm out of them.

So all in all I think that unless you are restricted to a small capacity for a specific racing class you should just get an LS7.

ps. I think that the Blacktop head will be better for your application

[Bazda]

Yes we were aware of the shroud issue but had a way to over come that (well make it better anyhow). Lynn Rodgers is the expert I just do what he says when it comes to head work .

Diff flow benches read diff, so its best to keep using the same one as you always do. Obviously Lynn's and Kelfords read very similar.

Id post up my flow chart but its at work.

[4agtepwr]

I knew I did something wrong when I built mine, should have started with an fe head

[Rookie]

^ This man, he knows.

[mega4a]

funny as.

[mega4a]

does anybody know the combustion chamber cc for a 4afe?