B B M HEADS

[cjshaker]

Good pictures.
I was really interested in the "swirl" chamber in these heads. Technology that's generally only seen on the latest performance heads, and good for keeping a suspended fuel mixture in the chamber and minimizing cylinder washdown. Along with the chamber design they should be happy with some pretty conservative timing. The only drawback I see is that the swirl is aimed at an opposite angle from the port entry, but the numbers Brent got seem to indicate it doesn't hurt flow any. Pretty good numbers for un-ported....if those numbers can be backed up. That intake port roof looks nice. It also looks like there's room for improvement with some gentle contouring around the valve guide and some unshrouding in the chamber for the larger bores.

The port exit on the exhaust looks very nice also. Although that would almost be detrimental in a shock towered car because of the tight bend needed on the header tube. Should work very well in a non-towered car. It will be interesting to compare the exhaust to the raised port BT head.

[bn69stang]

Sorry Rob my bad , i guess i was paying more attention to the finished product , thanks again ..talk to you soon ..Bud

[Ford428CJ]

I cant wait to see what Blair has to say about these heads and what he finds. Good to see what the conclusion is on everyone's part!

[bn69stang]

A block is on my list in a year or so , when i recover from this years buying spree lol , hopefully Rob has one to look at when i pick up my heads in a couple of weeks .. An all aluminum 482 would be cool http://fepower.net/simplemachinesforum/Smileys/default/cool.gif

[e philpott]

any new flow numbers yet with 2.15 intakes ??..... Brent , Blair or anybody ??

[BH107]

any new flow numbers yet with 2.15 intakes ??..... Brent , Blair or anybody ??

Rob posted these numbers on the other forum.

"For reference, I pulled some flow numbers from a BBM head we did last week. Standard set up with 2.150/1.680 valves, our valve job with very minor blend on the bottom edge of the seats to bowls, SF600 bench, machined plate entry radius and with & without 2" exhaust pipe.

.200 143/104 108(Pipe)
.300 208/140 144
.400 250/172 181
.500 282/195 203
.600 293/214 220
.700 295/219 229 "

[bn69stang]

Yes it will be interesting to see what Blair thinks , and what results he gets , and his porting opinion of the new heads .. Bud

[jayb]

Rob McQuarie
Blue Oval Performance
(our e-mail as listed here on the Forum is out of date, as we cannot correct it: blueovalperf at gmail.com)

I updated the email for you, Rob - Jay 

[Joe-JDC]

I just completed a valve job on a set with 2.080" intake valve, and 1.600" exhaust valve on Serdi valve machine.  Honing the guides took nearly two hours because of the hardness of the guide material.  My machine operator said it was the hardest guides that he had ever tried to ream/hone.  I had the typical multi-angle intake seat, and back cut the intake valve and a custom exhaust curved seat with 45* exhaust valve face.  Here are the flow numbers for these heads.

Intake
.100      63.98
.200     136.09
.300     207.18
.400     234.61
.450     243.85
.500     252.79
.550     261.14
.600     267.10
.650     274.25
.700     280.22
.750     284.99

Exhaust
.100      52.00
.200      98.30
.300     129.99
.400     149.49
.450     161.98
.500     166.84
.550     173.32
.600     178.18
.650     181.42
.700     183.69
.750     184.66/2" pipe 200.86cfm

This was on my Super Flow 600 # 6729 @ 28", 70* 38% humidity in airconditioned room and with a calibration test done on machine.  I will be cuting the seats for larger valves and retesting and I will report as I get this done.  Ultimately I hope test with 2.190/1.710 valves, and fully hand ported.  Joe-JDC

[ScotiaFE]

Hey Joe
Would these intakes be stockish Cobra Jet type with the 30* seat?
Really looking forward to some more of the test data of the bigger stuff.
You know pretty much any voodoo stuff your willing to release. 
Thanks for the effort.

[Joe-JDC]

Serdi mullti-angle with 45* seats on both valves.  I was surprised at the turbulence at low lifts from the seats being proud in the ports, and it will take a rather large valve to cut the throats out that far to get rid of the protrusions in the airstream.  Maybe just my heads, but still most folks who buy these will probably want bigger valves anyway.  Joe-JDC

[cjshaker]

Even BBM seemed to suggest that these heads were more suited for the 2.190/1.710 valves. Even mentioning up to 2.25 intakes, so the throats and bowls must be designed to support that? It will be really interesting to see how they progress with the larger valves and port work.

And I 2nd what Howie said, thanks for your effort and posting it, Joe.

[bn69stang]

Thank you Joe for posting , and keep us posted on bigger valves and any porting .. Bud

[RobMcQ]

Actually, 90% of our development and testing was done with the 2.150" / 1.660" and later, the 1.680" valves. The bowls, throats, and chambers were all designed to match to the 2.15/1.68 valves. (The seats will handle the larger 2.250/1.750 size valves, but the bowls, throats, etc. will have to be opened up to complement them.)  We used 45* seat cuts during all of our development work.  The I.D. of the seats were left small on purpose, and will "hang out into the port" with smaller valves - like 2.09"/1.60", requiring some blend work.

Our goal was to have the as cast port/throat match up very closely to the valve seat when cut for the 2.150/1.680 valves, using the special seat cutters we developed for these heads. Due to typical machining variables, the factory didn't get the seat inserts perfectly matched up to the throats, but they are very close and will only need some minor blending, once the valve job has been cut. The throat/valve percentage numbers fall into place, and the ports flow VERY cleanly without turbulence.

Rob McQuarie
Blue Oval Performance Engineering

[bn69stang]

It makes sense to the average guy explained that way , the Edelbrock even performs better with bigger valves , maybe one of fords better ideas was nt to use 2.09 / 1.66 with a 3/8 stem and a 30 degree seat , but its 40 plus year old technology . Either way im looking forward to my set of BBM heads .. Bud