AFR BBF Head

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Re: AFR BBF Head

Post  dfree383 on February 20th 2018, 2:48 pm

Carl wrote:Clearly a bogus marketing ploy.  Rolling Eyes

(joking)

Impressive work.  Congratulations!


.

Personal attack on.....

Now guys like you can build race engines that make more than 1.5 hp per cube! affraid

Personal attack off.... Razz
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Re: AFR BBF Head

Post  Lem Evans on February 20th 2018, 3:21 pm

STR-LGL-70 wrote:I just re-read through this build and maybe I missed it, but what is the bore & stroke?

Thanks, Sheldon

4.600 x 4.500 x 6.800"

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Re: AFR BBF Head

Post  STR-LGL-70 on February 20th 2018, 6:47 pm

Thanks for the info, impressive build!
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Re: AFR BBF Head

Post  cletus66 on February 20th 2018, 11:50 pm

At what RPM does the AC compressor belt start to slip?  
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Re: AFR BBF Head

Post  cool40 on February 21st 2018, 12:34 am

Cool looks like a torque monster.
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Re: AFR BBF Head

Post  Lem Evans on February 21st 2018, 10:25 am

cletus66 wrote:At what RPM does the AC compressor belt start to slip?  

How much belt dressing you got :-}?

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Re: AFR BBF Head

Post  Lem Evans on February 21st 2018, 11:04 am

Lem Evans wrote:

Considering the oil pressure....who can correctly guess the inches of Hg the vacuum pump was producing?

Freelander....you know about everything, how come you aint in on this?

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Re: AFR BBF Head

Post  dfree383 on February 21st 2018, 11:09 am

Lem Evans wrote:
Lem Evans wrote:

Considering the oil pressure....who can correctly guess the inches of Hg the vacuum pump was producing?

Freelander....you know about everything, how come you aint in on this?

651? pirat
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Re: AFR BBF Head

Post  bigford632 on February 21st 2018, 7:27 pm

Lem Evans wrote:

Considering the oil pressure....who can correctly guess the inches of Hg the vacuum pump was producing?

I'll take a stab in the dark and say it's a trick question and there was no vacuum pump.

Shocked

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Re: AFR BBF Head

Post  Lem Evans on February 21st 2018, 7:57 pm

You are right and wrong.......

It is only semi a trick question but it did have a pump on it.

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Re: AFR BBF Head

Post  glenevans on February 21st 2018, 8:38 pm

OK, had pump but not hooked up.....ha ha. Nice engine! Hopefully my new pan going to help keep oil pressure like this one.

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Re: AFR BBF Head

Post  Lem Evans on February 21st 2018, 8:56 pm

Here is a good read.....please read it all.

http://www.yellowbullet.com/forum/showthread.php?t=926370

Notice it's June of 2014 Smile

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Re: AFR BBF Head

Post  Lem Evans on February 21st 2018, 8:59 pm

glenevans wrote:OK, had pump but not hooked up.....ha ha.   Nice engine!  Hopefully my new pan going to help keep oil pressure like this one.

Wrong!! Very Happy Very Happy

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Dyno testing

Post  Gary Blair on February 22nd 2018, 7:58 am

Some testing on smaller engines might prove interesting. The AFR 270 CC vs a few other heads. Look at page 3 of this thread. Westech dyno testing.
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Re: AFR BBF Head

Post  dfree383 on February 22nd 2018, 11:31 am

I’m going to go out on a limb hear and say I don’t think any of the castings have any advantage over each other as cast.

Imo who’s doing the porting and valve job on the castings (whether custom or out of the box) does dictate what you get, but ultimately once you get to the 400-410 cfm I’m not convinced gaining more airflow equates to more power or going faster.

I’m also starting to think the valve location on these low port heads does nothing but make a good show on the flow bench and does nothing to make things go faster either, if it is a gain it’s not big or may even go unnoticed, but same goes with the port entry shape be it square or round.

All this AFR voodoo is is a good marketing deal and an out of the box product that make life simple for bolt on guys, all the other quality heads, TFS, P-51, Eddy, BT, SCJ, A429 and even factory iron all have the same potential if you put the time in them.

Lem built a nice 598 and good to see people building Fords in sea of Chevys
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Re: AFR BBF Head

Post  68formalGT on February 22nd 2018, 11:40 am

dfree383 wrote:I’m going to go out on a limb hear and say I don’t think any of the castings have any advantage over each other as cast.

Imo who’s doing the porting and valve job on the castings (whether custom or out of the box)  does dictate what you get, but ultimately once you get to the 400-410 cfm I’m not convinced gaining more airflow equates to more power or going faster.

I’m also starting to think the valve location on these low port heads does nothing but make a good show on the flow bench and does nothing to make things go faster either, if it is a gain it’s not big or may even go unnoticed, but same goes with the port entry shape be it square or round.

All this AFR voodoo is is a good marketing deal and an out of the box product that make life simple for bolt on guys, all the other quality heads, TFS, P-51, Eddy, BT, SCJ, A429 and even factory iron all have the same potential if you put the time in them.

Lem built a nice 598 and good to see people building Fords in sea of Chevys

Lem said he has a new set of P-51's maybe they can run the cnc program on them and not do any hand work to them and slap them on the same long block for a test. CNC head vs CNC head.
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Re: AFR BBF Head

Post  Straubtech on February 22nd 2018, 11:59 am

Nice job Lem and Philip. Very nice job. Rick and the staff and AFR have a nice piece and you guys made it shine!!!

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Re: AFR BBF Head

Post  BigBlockRanger on February 22nd 2018, 1:13 pm

As a hobbyist "bolt-together-guy" I am very happy to have more head options. Competition improves the breed, or so they say.

1k hp is nice, but the 14.4:1 CR is a no-go for most of us street/strip guys. I would love to see how these stack up when coupled with a more friendly compression ratio.
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Re: AFR BBF Head

Post  68formalGT on February 22nd 2018, 1:32 pm

BigBlockRanger wrote:As a hobbyist "bolt-together-guy" I am very happy to have more head options.  Competition improves the breed, or so they say.

1k hp is nice, but the 14.4:1 CR is a no-go for most of us street/strip guys.  I would love to see how these stack up when coupled with a more friendly compression ratio.  

I think Straub, Carl Hanson, Randy M, Scotty J, and others have built some pump gas engines using the AFR's with really good success.
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Re: AFR BBF Head

Post  bigford632 on February 22nd 2018, 1:57 pm

BigBlockRanger wrote:As a hobbyist "bolt-together-guy" I am very happy to have more head options.  Competition improves the breed, or so they say.

1k hp is nice, but the 14.4:1 CR is a no-go for most of us street/strip guys.  I would love to see how these stack up when coupled with a more friendly compression ratio.  

I have an AFR 315 build in planning and collecting parts and I'm thinking of going E85 at about 13:1 or so. This will be for a street driven pulling truck.

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Re: AFR BBF Head

Post  Straubtech on February 22nd 2018, 1:59 pm

BigBlockRanger wrote:As a hobbyist "bolt-together-guy" I am very happy to have more head options.  Competition improves the breed, or so they say.

1k hp is nice, but the 14.4:1 CR is a no-go for most of us street/strip guys.  I would love to see how these stack up when coupled with a more friendly compression ratio.  

Customer of mine in Winnipeg did a 531 back last year. It was right at 11.5 to 1 compression. It's posted on here. I think we were around 740HP

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Re: AFR BBF Head

Post  68formalGT on February 22nd 2018, 3:08 pm

^^^^^Were you able to use 90-92 octane gas at 11.5 cr?
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Re: AFR BBF Head

Post  Straubtech on February 22nd 2018, 3:16 pm

68formalGT wrote:^^^^^Were you able to use 90-92 octane gas at  11.5 cr?

Yes. I have asked the engine builder to send me the sheet on the engine.

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Re: AFR BBF Head

Post  Straubtech on February 22nd 2018, 4:43 pm

68formalGT wrote:^^^^^Were you able to use 90-92 octane gas at  11.5 cr?

Apparently I am not allow to post an attachment. Can't post dyno sheet.

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Re: AFR BBF Head

Post  Straubtech on February 22nd 2018, 5:16 pm

Here is the 521CID

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