Hi All,
just thought I'd put this out there to see what feedback is given and to confirm I seem to be on track...also understanding that a dyno is required for finer tuning...
I installed brand new Empi HMPX 44's on Wednesday, after checking the jetting and floats. I stopped playing with them on Wednesday and again today as it appears apparent that the idle jets are too small (50) and of course nobody in Darwin can help me. Rather than buying shitloads of jets i've purchased a set of jet drills to sort the problem out.
No matter what mixture is set (even the best idle) the car pops and surges around 1500-2500 then the car takes off revving easily to 4000rpm and wanting to go further (noting i'm running the engine in and don't want to over rev it just yet). I note that when I pull up the car almost stalls, which to me suggests the car may be running to rich up high possibly?
My plan is to up the idle jets to 55 and give it a go. Should this fail I'll try 60 as a last resort (there is no 57 in the drill set I've ordered).
For your info the carbs currently have in them;
choke: 36
aux venturi: 4.5
main jet: 155
emulsion tube: F11
air corrector jet: 175
idle jet: 0.50
accellerator pump jet with exhaust orifice: 55
needle valve: 1.75
And for those wanting to know engine specs;
Fully flowed and clearanced RIMCO case
CB performance MAXI 3 full flow pump - blueprinted
CB performance lightweight lifters
Scat 1.25:1 4340 pro comp ratio rockers
CB performance 2242 camshaft (294 intake duration)
CB performance Magnum 8640 chromoly straight cut gear set
New Steve Timms ported and cc'd 043 heads, 40x35 valves, ported, chromoly retainers, stainless valves, dual springs (to run 8:1 static compression) - Click here Heads
Match ported intake manifolds
CB 69mm welded crankshaft with 8 dowels, balanced
Scat 4340 chromoly I beam rods with ARP bolts
12lb german forged flywheel, 8 dowelled.
Gene berg deep sump extension (1.5 lt extra oil approx)
Aircooled net 6160 alloy pushrods
New Mahle A's P&B that have been balanced
Webber 5lb electric fuel pump
All new engine tin
1 5/8 hpc coated merged slip fit header
Black fatboy (for initial use - custom one to be fabricated)
Kennedy 1700lb pressure plate
Bosch 009 with compufire module
MSD 6AL ignition and MSD blaster 2 coil
Scat billet serpantine pulley kit
Any advise appreciated.
[ Edited on 28-4-2007 by reub-revhead ]
reub VWRX is gone...
2,054 posts · joined Sep 2002 ·
Reub
