in my experience, ported twin spark heads are almost the same than single plug head.
Same here. Dual spark heads, ported, with 38/33mm valves work very well. Wait till you see the professionally done heads I just got got back from porting shop. Fuck me, they took it up a notch! Can't wait to try those out. This last 1102cc build is a roadracing motor.
porting in progress here: http://www.apriliaforum.com/forums/s...tors-flow-rate
PS micah, PM for you
There is something going on with my pm notifications. They work fine on a my computers but my phone and I now use the phone so much for early morning and later evening surfing it is ridiculous. Will check in today Gabro.
The set of heads I just had done professionally are works of art. Here is to hoping the dyno and track agree. Both chambers cc's to identical specs, all ports flow matched to identical specs, all ports very reworked compared to what I would normally do, .4mm off bottom deck, Serdi full radius 1mm width intake seats and Serdi three angle exhaust seats also at 1mm width. My best previous gains from porting only on dual spark heads are right at ten bhp and on single it only 5 bhp that can be directly attributed to the porting. This will be a rather interesting test. The porting shop thinks I should see close to ten percent gain from the heads only...we shall see. This is not a street motor either, rather a track only 1102cc late model so big top end at the expense of bottom end is the goal. It will be fun to see what difference is made. Should end up running 06 Tuono intake cams on the hot side and 08 RSVR Intake cams on the cold side. Lobe centers are not decided yet but will probably be looking for intake closure at 56-60 degrees ABDC.
Anyone got a spare set of scratched up EVO6 headers or even a damaged Leo BIG system? I would really like to see 138-142 bhp on my dyno from this motor on gasoline. If required it can also be run on E85 for roughly 10-11% greater power yet. There are some seriously fast twins we race against so this motor is a countermeasure to ensure the old 04' RSVR can stay at the front of the grid and in people's thoughts at the track!
That looks like a Sweet road race build Micah , damn fine !!! I am gonna watch this page for progress , this is exactly where I would like to take my Tuono !!!
Post up the dyno as soon as she's burning motion lotion , please !!!
SPEED IS RELATIVE OFFICER
That was some Damn Fine eye candy Micah!!
(the pics you posted of this build)
#1 Forum Magic Missile Caster
"I rode a Griso at when I used to work for Aprilia City in Melbourne. Probably the nicest bike ever" - Cosaro
2007 Moto Guzzi Griso
1988 Yamaha FZ750 rat bike
That RSV4 sure is nice looking, but those wheels are hideous!
Fast red 03 Tuono, dual Renegade exhaust, Renegade style intake, FP Tuono chip, 57mm TB's. SOLD
1989 Kawasaki ZX 10 with a modded 2003 ZZR1200 motor. 41mm Keihin Flat-slides with the long stacks, stick coils, and a Micron pipe. I forgot the comfy Concours clip-ons.
Thanks for the pics! Magic, Art, Wizardry? I like seeing how it all goes together. Mechanical stuff fascinates me but it is always hidden away lol.
'02 RSVR '07 S4Rs '08 FXSTB '75 GT550 '74 H1 500 '71 CB750 basket case
Much more to ccome, getting on a plane for Florida tomorrow for dealer meeting in Miami. Get to ride new SRV and Tuono v4 and possibly the RS4. gonna be a busy weekend, be back in the shop Wednesday and hopefully have a good story to tell from the meeting.
At dealer meeting. They unveiled the V4 Tuono for the USA market, ddead sexy bike, should get a chance to ride today. They also showed the SRV850, new BV350 and new Stelvio. Demo rides and smart meetings today. Off to see the wizards...
Good god, 4am Florida time is brutal early, especially being east a time zone and back and hour this weekend. I hate waking up early, expecually what my body thinks is 2am. Be home later barring any technical difficulties.
Micah grumbles, "hold on, let get my tools out of the baggage compartment, I'll fix that sh!t 10 times faster then the ground crew."
Raoul Duke Media LLC
While he figures a way to get one of those GE turbofans on his dyno.
2003 Magnet Gray Tuono - Arrow 2-2 Race System - Gabro "F255" Chip - Ohlins Axial Front Forks - Ohlins Rear Shock/Hyperco Spring - RSV-R OZ Forged Wheels - 16/42 525 Chain/Sprocket - AF1 Keychain