Because CNC
#163
So, what I have settled on is a baseline from an HPDE style build like that in our 95R. Stock long block, I/H/E and ECU. Swap for BP6D +1 O/S head and stock cams. The +2 O/S head will not get any comparison because no relevant comparison with a stock long block can be made. The +2 O/S head requires special pistons or at least custom machining of whatever OTS pistons you're using. That affects combustion too much to do meaningful A/B with a stocker.
Anyway, we are still working on getting A/B test done. The +1mm O/S intake & exhaust CNC head flows an average of 13% more. That translates to just under 10% power gain based on previous tests. So your 140whp OEM long block build becomes about a 153whp engine by swapping our base CNC head on. Add cams and the A/B percentage jumps a bit.
The +2mm O/S exhaust (+1mm O/S intake) head is really for those with either boost, big revs, big cams or all of the above. IOW, if you really need the +2 head, your build willl be so far from stock that anything I publish won't be relevant. We do hope to get 210whp and about 170tq out of the current 2.0L engine we're putting in the OGK.
__________________
#165
From memory, 204cfm @ .350 valve lift, BP6D is the same. Our CNC head has a greater increase at at mid valve lifts than peak lift so curtain area is better. Optimized for stock to slightly larger cams. The +2mm O/S is optimized for bigger cams so it's greatest increase over stock is shifted up about .050 over the +1mm head
__________________
#166
Moderator
iTrader: (12)
Join Date: Nov 2008
Location: Tampa, Florida
Posts: 20,645
Total Cats: 3,009
I'm guessing that unless the test is conducted on the same test apparatus there will be a significant margin of error. I know there shouldn't be, but there probably is... much like one chassis dyno to another.
Last edited by sixshooter; 01-30-2014 at 01:14 PM.
#176
Just finished tuning with my new "supermiata CNC head". Mine has stock bp4w cams and +1 valves
Engine setup:
85mm 11:1 wisecos
racing beat header
2.5" exhaust terminates by rear axle
Vics manifold. Locked in the low rpm setting
skunk2 TB for throttle shaft security only
intake pipe about 23" long going over to pass headlight area.
diypnp ms2
batch fire/ wasted spark
Im happy with this:
Engine setup:
85mm 11:1 wisecos
racing beat header
2.5" exhaust terminates by rear axle
Vics manifold. Locked in the low rpm setting
skunk2 TB for throttle shaft security only
intake pipe about 23" long going over to pass headlight area.
diypnp ms2
batch fire/ wasted spark
Im happy with this:
#177
Moderator
iTrader: (12)
Join Date: Nov 2008
Location: Tampa, Florida
Posts: 20,645
Total Cats: 3,009
Just finished tuning with my new "supermiata CNC head". Mine has stock bp4w cams and +1 valves
Engine setup:
85mm 11:1 wisecos
racing beat header
2.5" exhaust terminates by rear axle
Vics manifold. Locked in the low rpm setting
skunk2 TB for throttle shaft security only
intake pipe about 23" long going over to pass headlight area.
diypnp ms2
batch fire/ wasted spark
Im happy with this:
Engine setup:
85mm 11:1 wisecos
racing beat header
2.5" exhaust terminates by rear axle
Vics manifold. Locked in the low rpm setting
skunk2 TB for throttle shaft security only
intake pipe about 23" long going over to pass headlight area.
diypnp ms2
batch fire/ wasted spark
Im happy with this:
So everyone knows, this is on e85.
#179
Moderator
iTrader: (12)
Join Date: Nov 2008
Location: Tampa, Florida
Posts: 20,645
Total Cats: 3,009
Yes, everybody knows that. He is looking to keep a flat HP curve for classing in TT or PT with NASA. That is why I said after it starts to drop off he might could open VICS and pick up enough to keep the curve flat but not increase the max numbers.