Quote:
Originally Posted by unclebilly
Look at my Garage. I covered off the 2.7 build I did for my track car there.
unclebilly's Garage :: Crop Duster
I have a 2.7 with 9.5 JEs. I shimmed the cylinders / heads to get 9.8:1 compression.
I ported my heads to 36mm like a 2.7 RS.
At 9.8:1, you can run single plug. I ran 91 mixed with race gas at the track and straight 91 on the street.
I am running MSD, early HEs, and 34mm chokes in Webers with the PMO manifolds.
I have DC40 cams, you will want something like this as opposed to the E cams which are too peaky.
On the Dyno, this was within 5 HP of the engine in Magnus Walker's 277 car (2.6 short stroke with 10.5 and twin plug built by Andrew15). My torque curve was also a lot flatter.
If it you do go twin plug, do yourself a favour and use 2 EDIS distributorless ignition systems. You can do this all in for around $500. Either way, you will want to run an RS ignition curve.
Your trombone cooler will no longer provide enough cooling so you will need to add additional cooling. |
DoooooWHAT!? As ^ said, yes please try to find your Dyno results. That is insane. Care to share complete breakdown? I am astonished that single dist, 2.7 made that beautiful of a tune basically off higher comp, Port job, mild cams and RS ign curve. Magnus was on MFI, and HUGE ports and gnarly cams comparatively, additionally- 3.2L... Please elaborate so that I can stop pounding MY head as well!!!???- "to go new cyl so I can punch out to 2.8 or to just leave 2.7" "Do I donate a kidney to get MFI and Twin plug or no" etc etc... And I quote-
"Naturally-aspirated 3.2 liter short stroke flat-six boxer engine built by Aaron at Rennwerks; J.E. pistons; single plug ports; 39 intake/38 exhaust; Hi lift Mod S cams; stock rods with ARP rod bolt;s AASCO racing valvesprings; Titanium retainers; stainless valves; 1-5/8″ headers; M&K twin pipe R muffler; mechanical fuel injection; stacks bored and port-match from 46mm at the opening tapering to 41mm; throttle bodies bored to 41mm; throttle plates port-matched; 69E injection pump re-calibrated for 3.2; isolated oil supply; solinoid delete; thermostat delete; red vent cap; Elephant Racing finned external oil cooler lines; Carrear front mounted oil cooler; long-filler neck fuel tank; Rennline battery kit w/ lightweight Optima battery..