Wanted: Spi Tuning Guide
#1
Posted 12 September 2007 - 07:21 PM
John
#2
Posted 12 September 2007 - 09:11 PM
Big exhaust
37 x 29mm valve gas flowed head
1.5:1 ratio roller tip rockers
11:1 compression ratio
Kent 274 scatter pattern cam
Lightened Vernier timing gear
Lightened cam followers
Fully lightened crank
Lightened con rods
Ultra light flywheel and backplate with orange diaphragm and AP racing friction plate (requires crank sensor kit from either KAD or Specialist Components)
Full engine balance
inlet manifold ported to match head and doweled to locate
Throttle body modified to 44mm
Throttle body ported to match inlet manifold
Larger injector from Rover K8 1.4SPi engine
Cooper SPi ECU
3.44:1 final drive
Recon on about 80 - 100bhp dependant on CC but expect issues at the higher end on the standard ECU with fueling and emissions no matter what you do
keep the CC to the standard over sizes and i doubt you will have a problem, the car will be extremely lively. Dont get hung up on the numbers of bhp, its the feel of the drive, not the power output that matters.
#3
Posted 13 September 2007 - 09:40 AM
not too bothered about big numbers i just want a nice drive.
Edited by minimadmotorman, 13 September 2007 - 09:45 AM.
#4
Posted 13 September 2007 - 04:55 PM
i ran 11.5:1 on a standard ECU with 99 RON
#5
Posted 13 September 2007 - 08:25 PM
yes you will need to run at least 97 RON unleaded
i ran 11.5:1 on a standard ECU with 99 RON
cheers sprocket. i will get started.
Edited by minimadmotorman, 13 September 2007 - 09:22 PM.
#6
Posted 01 October 2007 - 05:38 PM
Also what route would you go down to alter CR? (different stoke length, different pistons etc?)
#7
Posted 01 October 2007 - 06:43 PM
Skim the head to get the compression up, you could also skim the block in some instancies, IE the non cooper engine has roughly 4cc above the piston, excluding the piston dish.
#8
Posted 01 October 2007 - 07:19 PM
Rimflowif you have the money and the rest of the head is optimised, not much use on a standard head.
Skim the head to get the compression up, you could also skim the block in some instancies, IE the non cooper engine has roughly 4cc above the piston, excluding the piston dish.
Is it only worth using the rimflow valves on the inlet side?
I think i'm going to have to rob the piggy bank soon
#9
Posted 01 October 2007 - 09:54 PM
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