250 Gte Distributor
250 Gte Distributor
Hi Tom & All,
happy easter to you.
I dismounted one 250 Gte distributor today to check for wear and found two different length of springs in the weights. See picture. Is this normal?
Thanks
Christopher
happy easter to you.
I dismounted one 250 Gte distributor today to check for wear and found two different length of springs in the weights. See picture. Is this normal?
Thanks
Christopher
Re: 250 Gte Distributor
Chris, I cannot answer your question, but there is a guy in california that does all things distributors - Marelli is his speciality....i can't recall the name, but web search or marelli dist services and he should babble to answer your question.
i assume that is md 85 distributor?
i assume that is md 85 distributor?
Ed Montini
330 GT 2+2 Series II - 8289
58 Ellena - 0855GT - orig drivetrain
87 El Camino SS
330 GT 2+2 Series II - 8289
58 Ellena - 0855GT - orig drivetrain
87 El Camino SS
Re: 250 Gte Distributor
Hi Ed,
Thanks. I meanwhile have the answer. Yes, that is as it should be.
Thanks
Christopher
Thanks. I meanwhile have the answer. Yes, that is as it should be.
Thanks
Christopher
Re: 250 Gte Distributor
Hi Chris,
As you have learned the different springs allow the weights to progressively advance the distributor as the speed increases.
Tom
As you have learned the different springs allow the weights to progressively advance the distributor as the speed increases.
Tom
'63 330 America #5053
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- Posts: 1908
- Joined: Wed Sep 04, 2002 12:13 am
- Location: San Francisco Area
Re: 250 Gte Distributor
Chris, that is correct, the pair of coil springs are not only unequal length but are also made of different gauge wires. There are also shims between the cups and the pins. These shims along with the tension of the coil springs, as well as the tension of the leaf springs dictate the profile of the advance curve. There should be an "X" scratched on one of the weights and another "X" scratched on the corresponding pivot pin. Then there is another "X" scratched on the lobe hub. Make sure the three X's" group together. When you take things this far apart, it's best to have the distributors re-calibrated. Good luck.
john
john
PF Coupe
Re: 250 Gte Distributor
Hi John, Tom,
Thanks a lot. I had marked everything when I dismantled it as I was not aware of the factory markings. I have looked at the parts now and found all the ,X‘. I will definitely have both tested foe their advance curve before using them. Thanks for sharing your knowledge! That is bid help.
Christopher
Thanks a lot. I had marked everything when I dismantled it as I was not aware of the factory markings. I have looked at the parts now and found all the ,X‘. I will definitely have both tested foe their advance curve before using them. Thanks for sharing your knowledge! That is bid help.
Christopher
Re: 250 Gte Distributor
Dear All, dear Tom,
is this the right distributor advance curve for the 250 Gte? Thanks a lot.
Christopher
is this the right distributor advance curve for the 250 Gte? Thanks a lot.
Christopher
Re: 250 Gte Distributor
Just to add. This comes from the Service and Maintenance handbook but it irritates us as it does not corresbond with the manual data?
Thanks
Thanks
Re: 250 Gte Distributor
Thanks, have needed info thanks to GTO. They informed me that the curve is identical to the 330Gt and provided attached table.
Thanks
Christopher
Thanks
Christopher
Re: 250 Gte Distributor
The Distributor guy in CA is Tom Meadows.
https://marelliservice.com/contact-us
https://marelliservice.com/contact-us
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- Posts: 1908
- Joined: Wed Sep 04, 2002 12:13 am
- Location: San Francisco Area
Re: 250 Gte Distributor
Chris, the centrifugal force starts moving the weights at about 500 RPM and at about 2500 RPM they have been flung out as far as they can go. So, in a standard distributor your advance starts at 1000 engine RPM and it maxes out at about 5000 engine RPM. Here is my reference for setting up the advance profile. This suggests that the max advance is at 4000 RPM, but my experience shows it goes a little past that.
john
john
PF Coupe
Re: 250 Gte Distributor
Hi John,
Thanks. That curve is perfectly in line with the data from Gto. So we are on the same side.
Thanks a lot
Christopher
Thanks. That curve is perfectly in line with the data from Gto. So we are on the same side.
Thanks a lot
Christopher