weeks of 2/5 and 2/12

2/6 AM HTG trail port XCR800/ Edge 600 chassis The HTG pump gas XCR800 trail port with HTG pipes made 180 at .70 and 192 at .58 lb/hphr, HP peak from 8200 to 8500 depending on fuel flow.
2/7 AM Charlie Primmer with a troublesome Hooper 1365 triple.Charlie and I struggled with this, HP peak was  not smooth– humps and valleys, while changing main jets noticed only a drizzle of gas in float bowls after 10 second dyno runs, found  1.5mm needle and seats fouled a bit with corrosion/ debris, switched to new 2.0mm n&s and  had to jet down to achieve same lb/hr fuel flow. No more humps and valleys, Charlie’s radar run sled is still a bit low on HP with 270 (considering displacement) but should not surge and gurgle anymore like it did with undersize partially obstructed n&s’s.
2/8 AM Larry Frasier ZR900 with full D&D trail package porting/ pipes/ Boondocker we tweaked Larry’s sled to safety with 170HP, high .60s BSFC but the EVs opened way too early for twin pipes, early EV opening = airflow drop causing rich condition that we had to go negative with boondocker to partially correct
2/9 AM Vince and Bill Logan, 518ers (518 area code HP madmen) Vince’ juiced/ piped Mach Z tickled 250 HP, Bill’s all-motor MachZ out-HP’d Chuckaroo by a few tenths of a HP, will post Bill’s dyno sheet.
2/10 a HTG ported CS twin pipe MachZ, also with juice to boot made 198 on mostly last season’s pump gas left in tank, but never got chance to shoot N2O since we frosted a plug in midrange trying for 200–that makes two frosted MachZ 2-pipe plugs on two sleds (caught before seizure could occur) in midrange with seemingly safe A/F ratio and BSFC. Need to boondocker these twin pipers heavy in middle WOT to make them safe.
 2/11 AM thru 2/12 noon Marathon session, 5 [Massachusets] sleds to dyno tune (maybe we’ll begin Friday PM).Ed Derby and pals; spent most time with a troublesome Pol 800 twin w/ billet 900 cylinders, made way less airflow CFM and HP than a different brand billet 900 Pol twin topend tuned here two weeks ago. Will investigate cause. Had better luck with same brand billet 860 cylinders. But that sled had boondocker carb N2O kit that was impossible to dynotune (as opposed to EFI boondocker N2O which are a delight to dyno). I don’t think the boondocker system of pressurizing floatbowls to add fuel can possibly work reliably with any sort of HP–I will post those results. Anyone who is making good HP with that kit please email me.  Ed dyno tuned two Carl’s Cycles built Polaris twins–a low comp 660 that made mid 140’s and a 800 twin trailport that made 155 with a quiet single pipe (nearly as much CFM and HP as the troublesome billet 900 created with twin pipes).  Finally a previously often-seized F7 carb 780 big bore, now tuned to mid 150’s HP at .70 lb/hphr and similar very safe BSFC in cruise mode at all midrange part throttle positions on the dyno. All tuning done with 120 degree F coolant temp. Sled is now fitted with coolant temp gauge.
2/14 late PM, Sam Verduce Boondocker tuning on  Bikeman F8 single pipe trail sled Sam’s F8 dyno session was four hours, added 2.5 degrees of timing, dialed in  160+ Hp at .65 BSFC and a second boondocker map 157 HP at .70x lb/hphr BSFC from 7300 to 8000 RPM. one hour of the test session was devoted to creating optimum cruise A/F ratio to obtain safe fuel flow without drowning engine, expect now an extra 3 mpg?
2/16 AM a tweaked F7 non-Boondocker will dial in with fuel pressure if necessary Five Star Ken had 04 stocker with reprogrammed ECU, Bikeman mod stock pipe, 2.5deg key, only 98 lb/hr fuel flow at 44 psi gave him 154 HP @.low .60s lb/hphr NO FUEL CHOKE ALLOWED also tried his MBRP can, lost 5 HP you will see that on Ebay. PM John T Cowie’s infamous Ultra now 1080cc HTG mod, now a bit more compression and stock can removed in favor of higher flowing individual silencers/ stingers.JohnT’s HTG Ultra made 261 HP this time, with ice cold water in the engine like he does dragracing–with fresh fuel and good vaporizing carbs like Lectrons there are no cold seizures.