The 'E' Type Forum

It will idle at a constant RPM, then after a run it will change. It doesn't fluctuate at idle. Mike That tells me that the butteflies don't return to the exact same position after they were operated by the throttle mechanism. Either they are sticking or play in the throttle linkages is not consiste...

SESH wrote: ↑

Mon Jul 15, 2019 6:34 pm

It tends to now idle between 600-1000 RPM but it varies a bit.

Does the idle speed vary like that as it stands there, idling, just being left alone? Or does it choose a new idle speed every time after throttles were operated?

I only drove it 4 houses down and back and forth so i didn't go far.

I find that my car is also rather down on performance until its off the choke AND the carbs have some heat in them. So do not expect full performance with a cold engine.

Lack of vacuum advance typically makes an engine feel lethargic on partial throttle. But with "only 40hp", I tend to agree with Simon that IF carb tuning and timing is good, most likely you have air supply issue. I had this issue when rebuilding a S3 for a friend. Turned out the vertical shafts were...

I'm not quite sure what your definition of low compression is, but the V12 in any of its guises is not in my book anywhere near low compression at 10:1 with the Heron heads and 12.5:1 with the May heads . However, I would not differ greatly from your 12 deg BTDC at idle, provided that it does not c...

I believe the SNG kit comes with a vacuum RETARD module (vacuum connection on dissy side of the "flying saucer") on the dissy as per the original V12 setup. This vacuum retard setup was Jaguar's solution to meeting the emissions targets OF THOSE DAYS, and is, in my view, an abomination just as scand...

Mike, what ignition system does your car have?

I add about this ECU that 2 of the last V12 E type restored by Etype UK are equipped with this K6 ECU. It should be said at the same time if the original low impedance injectors and fuel rail were used or high impedance injectors. I say again. Using current limit resistors IS NOT a good solution fo...

Dear Michel With my previous posting, I only looked at Emerald from a technical viewpoint. This morning, I looked at its price and was shocked to see how expensive it was GBP714 (Euro827) !! By comparison, a Megasquirt-2 will be about USD350 (Euro312) - including a few extra bits and pieces. MS-2 wi...

Michel I see that the Emerald K6 can only handle high impedance injectors (14 - 16 ohm). This is normal. The jag injectors are low impedance . In the FAQ of Emerald's web site they say that one can run low impedance injectors with K6 using ballast resistors. This is only partially correct. Using bal...

I suggest you get the car running with original ECU.

DO NOT UNDERESTIMATE the complexity of tuning an engine. If you have not done so before, don't even try. Take it to someone who knows how to do it.

I mounted my Megasquirt ECU against the "ceiling" of the passenger footwell. I needed easy access to it with the comms cable from my PC. IF you can find space in the boot, mount it there otherwise you will have to change some wiring (eg, to the fuel pump). There is an unused plate on the passenger s...

When re-commissioning a friend's car, we purchased a new sender AND gauge from the co now representing Smiths. The sender I received looked correct physically, but it was a mismatch against the gauge. It turned out the Gauge was wrong. The second shipment they sent was correct. I found the info whe...

Also thinking of changing the diff ratio, currently 3.54, to either 3.31 or 3.07, the latter would maybe make the OD too long? Do u still have the 3.31 that u swapped out? Yep, I still have the 3.31. Thought I would need it in my Chev C10 project if I end up fitting a jag front and rear suspension....

not sure if the e-type manifolds fit onto HE heads, e-type exhausts hug the block while HE pipes splay out? just the efi may not provide significant benefit over existing carb'd engine? Also hi-comp HE provides better performance and efficiency compared to even the 1980 10:1, the reason why the lat...

"Presumably I need the HE heads as well as the pistons and liners so maybe an XJS engine swap maybe easier." Correct. It all comes down to whether you want to be able to claim a "matching numbers" car. I recon you could still claim "matching numbers" even if you install the complete (!!pre-HE!!) XJS...

1970 Chevrolet C10 pickup truck:
350 Chevy V8;
Drum brakes all round;
Manual steering;
Manual brakes;
No seat belts;
No ventilation or heating system.

Were they 1980 only? I'm not sure. I do know it was only the very last of the pre-HE's that had this 10:1 engine and it may only have been for the European market because of fuel quality. I'm really not sure of all this. Kirby's book might have more accurate info. Also, could you run the HE pistons...

There are two other (inexpensive) options you may consider... 1) The 1980 XJS pre-HE 5.3 engine came with 10:1 CR. Scarce, but if you can find a good set of those; 2) Convert the engine to Euro spec HE with 12.5:1 CR. I did this on that E-type I EFI'ed, fitted the HE pistons and heads to it. It ran ...

Hello Phil. The performance curves I posted are not my cars, not even real, they are copied from automobile-catalog, this uses car dynamics simulation software i.e https://www.automobile-catalog.com/simulation.php :lol: In that case, I can be more direct. I think those curves are seriously flawed. ...