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91

Tech Torque Pre 1973 / Re: Distributor for a 302W stroked 347

« Last post by jiffy on March 01, 2024, 02:57:37 pm »

I think you're about to get some big bills.
So - if the dist gear is wrong for the cam, there's NO WAY it should have been assembled. DO NOT RUN IT until you have the right dist gear installed.
Pick your battles...
Measure the timing - just because it detonates, it doesn't mean it's too far advanced - running too rich or too lean may also cause it to ping. You need to MEASURE the timing and make changes because you can see a problem, not because you're throwing money at the dart board trying to replace everything until it stops overheating.

Was the carb re-jetted to suit the large capacity? If it's still jetted to suit a 5.0Ltr but it's now a 5.4L then it'll be too lean.

You need to get it tuned by someone who has all the right tools. I would get rid of the 2-barrell carb and manifold for a 4-barrell, your wife won't want to drive it when it's running like a POS any more than she will if it goes hard. Get it running well before worrying about your wife's level of enjoyment....

92

Tech Torque Pre 1973 / Re: Distributor for a 302W stroked 347

« Last post by trentsiddharta on March 01, 2024, 12:52:20 pm »

Yes. I know. Doesn't seem right.

4-barrel would be better but from the perspective of it being a second car that my wife drives, it's unnecessary. Cost is also a factor.

Happy wife...

93

Tech Torque Pre 1973 / Re: Distributor for a 302W stroked 347

« Last post by GEOFF289 on March 01, 2024, 12:38:10 pm »

Carb - Factory 2-barrel. No choke (doesn't help)
Manifold - Factory
Cam - Steel roller 1.5
Heads - Original factory. Machined. New hardened valve seats.
Compression - will need to find out.
Distributor - old school Autolite

It's a 347 but has a 2 barrel carb?

94

Tech Torque Pre 1973 / Re: Distributor for a 302W stroked 347

« Last post by trentsiddharta on March 01, 2024, 10:54:06 am »

Thanks Glenn (and everyone) I really appreciate this.

I'm 2% of a mechanic and have been taking advice from my current/soon to be previous mechanic, so my knowledge isn't exhaustive.

Carb - Factory 2-barrel. No choke (doesn't help)
Manifold - Factory
Cam - Steel roller 1.5
Heads - Original factory. Machined. New hardened valve seats.
Compression - will need to find out.
Distributor - old school Autolite

The distributor needs the gear swapped for melonized to suit the cam, so I considered a new on altogether.

I'm also looking to replace the carb with the same but an electric choke.

95

Tech Torque Pre 1973 / Re: Distributor for a 302W stroked 347

« Last post by GLENN 70 on March 01, 2024, 09:57:07 am »

It can be a lot of things . Your timing should be around 12 to 18 deg initial with the vacuum advance blocked .  The total timing should be 32 deg at around 3,000 rpm .  Getting these numbers  with a stock distributor won’t work .  All this depends on the engine mods .  More info please ,what carb and jetting , intake manifold ,heads ,cam and compression . 

96

Tech Torque Pre 1973 / Re: Distributor for a 302W stroked 347

« Last post by trentsiddharta on March 01, 2024, 09:31:23 am »

The timing is advanced and it is pinging. If it's not advanced it dies. My 'mechanic' indicated the dizzie but also said that it needs a 351 dizzie, which isn't obviously correct.

When it was stock 302 it had no overheating issue since putting in a large core radiator and fans.

97

Tech Torque Pre 1973 / Re: Distributor for a 302W stroked 347

« Last post by jiffy on March 01, 2024, 09:25:09 am »

Before you decide that the distributor is the culprit, do some more digging.

A symptom of the timing being too far advanced is pinging (a death rattle in the engine when accelerating)
A symptom of the timing being too far retarded is overheating.....

Before spending a lot on a new distributor that may - or may not - fix the problem, borrow or buy a timing light and measure the timing.

Block the vacuum advance hose to the carb. Measure at idle, 1500, 2000, 2500, 300, 3500, 4000rpm.

Let us know what you find.

Investigation is generally cheaper than throwing money at an issue and hoping for it to be a fix.

Other causes of overheating:
buggered clutch fan
fan too small / not enough blades
no shroud
small radiator
blocked radiator
head gaskets on backwards
too lean

etc etc....

98

Mustang Chat Room / Re: Dart engine

« Last post by jiffy on March 01, 2024, 09:20:14 am »

^^ This ^^

99

Mustang Chat Room / Re: Dart engine

« Last post by GEOFF289 on February 29, 2024, 08:12:32 pm »

Those numbers come to 336 cubes. Likely you've got the stroke slightly wrong and its 331 which used to be a pretty common stroked 302 before 347's became popular. One theory is that the 331 is happier because the rod length to stroke ratio is better.

If its a Dart block I guess someone could have put some old 289 heads on it but you have to wonder why. It's probably a good basis for some aluminium heads and bigger cam.

100

Tech Torque Pre 1973 / Re: Distributor for a 302W stroked 347

« Last post by GEOFF289 on February 29, 2024, 08:01:35 pm »

Also not cheap but very highly regarded both for product and advice is https://www.iceignition.com/. They are made here.

Or get one of these like I have and tune it with your phone https://progressionignition.com/