Static timing for a 4.6 engine??

mgbv8 · Post by **mgbv8** » Sun Jul 05, 2009 9:09 pm

What would be the normal setting at 900rpm for the 4.6 ??

CastleMGBV8 · Post by **CastleMGBV8** » Sun Jul 05, 2009 11:42 pm

Perry,

I'd guess the static for a 4.6 would be around 6-8deg. but as on the standard engine it's controlled by the ECU it's not easy to say specifically.

Most engine tuners would work back from a total advance figure and for the 4.6 according to JE Developments that is 28-30 deg. by approx 3000 RPM.

I would suggest running the engine and revving until you establish the RPM figure at which total advance is achieved, and then work backwards and see what the advance is at 1000RPM, if it's around 10 deg that would be fine off gas, and then you just dial in your on gas retard.

I think you have a Mallory which I think gives 22 deg of mechanical advance so you may have to tweak it a bit to get the ideal figures. Presumably you are running without vacuum advance.

http://www.malloryperformance.com/pdf/29014.pdf

Kevin.

v8 pete · Post by **v8 pete** » Mon Jul 06, 2009 9:23 am

mallory and a 4.6
i need to redo timing what is the best method
rev to 3000 and adjust dizzy to give max advance[do you have vacuum conected or disconected].
then check idle at low revs with dizzy diconected
once done reconect vacuum and readjust idle speed.

my engine used to have both vacuum pipe connected to dizzy from the weber 500 carb ,i thought this was wrong but have read in manaul if using non standard cam it may be used. [any thoughtson this and reasons please]
regards pete engine running very hot at idle at the moment.and over heating if reved up .

CastleMGBV8 · Post by **CastleMGBV8** » Mon Jul 06, 2009 9:59 am

Pete,

You seem to have a couple of issues here and the overheating should be dealt with first as this can cause permanent damage.

Rover V8's can be very prone to air locks in the system, can you show a picture of you set up ?

Running the ignition too retarded can aggravate overheating issues.

The staticc advance should be set with the vacuum disconnected aim at 10 degrees to start with and either limit vacuum advance to 5 degrees or disconnect completely and put a bung on the carb.

What spec is your engine heads cam etc.

http://www.malloryperformance.com/pdf/29014.pdf

Kevin.

v8 pete · Post by **v8 pete** » Mon Jul 06, 2009 10:24 am

kevin
4.6 in a westfield
head mods unknown but inlets and exhausts well enlarged cam unknown
v8 devopments engine
not sure how to post picture on here but can send you one by email
no air locks to my knowledge
rad tec 4core unversal polo type rad

v8 pete · Post by **v8 pete** » Mon Jul 06, 2009 5:18 pm

set to about 14deg at idle does not like any less.
32deg in at 3000rrpm

marcosman · Post by **marcosman** » Fri Jul 10, 2009 3:08 pm

I run a Mallory with Weber 500 on my 4.6, I adjusted the mechanical advance to the minimum 16 degrees (max 24) and run with 12 degrees at idle giving 28 degrees at 3000rpm. Interestingly, increasing the total advance to 32 gave a slight increase in power over 3000rpm but sacrificed a little below that so left it at 28 degrees in total.