headwork aka port & polishing info

[bsinclair]

thought i would give a update.. here is what the head flowed..
We gained 10%@ .05 valve lift which should be good for 5-7hp over stock ports..
7@.1
7@.15
7@.2
10@.25
10@.3
15@.35
19@.4

[RansomT]

Originally Posted by bsinclair

thought i would give a update.. here is what the head flowed..
We gained 10%@ .05 valve lift which should be good for 5-7hp over stock ports..
7@.1
7@.15
7@.2
10@.25
10@.3
15@.35
19@.4

For what it is worth, Bob picked up ~8 wHP with his port job. I bet more could be had by extending the rev limiter with a port even with stock cams.

[bsinclair]

Originally Posted by RansomT

For what it is worth, Bob picked up ~8 wHP with his port job. I bet more could be had by extending the rev limiter with a port even with stock cams.

yeah by looking at cecil's dyno chart his made max hp at the rev limiter. when i spoke to kevin hunt (kws) a few years ago he said the stock valve springs were close to coil bind. i wonder if it would be safe to raise the limiter another 2-500rpm if bren tuning is able to flash the ecu..

[BryGuy900]

Originally Posted by bsinclair

thought i would give a update.. here is what the head flowed..
We gained 10%@ .05 valve lift which should be good for 5-7hp over stock ports..
7@.1
7@.15
7@.2
10@.25
10@.3
15@.35
19@.4

So did he come up with a price yet for ya? Also have you ordered your head gasket yet? They offer 3 different sizes. If you get a chance could you measure you old one as i wonder which size comes on it from factory.

[bsinclair]

Originally Posted by BryGuy900

So did he come up with a price yet for ya? Also have you ordered your head gasket yet? They offer 3 different sizes. If you get a chance could you measure you old one as i wonder which size comes on it from factory.

yes, $750 and that includes dis-assembly , cleaning , porting , milling , reassemble and return shipping. since I'm promoting this for Bill I will handle and answer all questions for the bmw stuff. once i get mine assembled i plan to have him do my other head for exchange or purchase out right. if exchanged i will require a $500 deposit until the core is received.

i feel you will find this a very good deal as carpenter racing charges $1650 for this same service and doesn't include shipping.

[luker669]

That is a great price ... Are u going to do a dyno ?


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[bsinclair]

Originally Posted by luker669

That is a great price ... Are u going to do a dyno ?


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yes, after its completed im headed to brocks to make a pump gas and mr12 map

[Rush66crp]

Stupid question to follow...

What exactly would have to be sent? The entire motor? I'm not familiar with this process. Thanks.

[kismetcapitan]

Originally Posted by bsinclair

yeah by looking at cecil's dyno chart his made max hp at the rev limiter. when i spoke to kevin hunt (kws) a few years ago he said the stock valve springs were close to coil bind. i wonder if it would be safe to raise the limiter another 2-500rpm if bren tuning is able to flash the ecu..

I'm fairly certain BMW was running over 15,000rpm on their WSBK bikes. Have no idea if they were using different valve springs or cams, but I'd guess yes?

[BryGuy900]

Brock has a happy dyno