Re: Carbon Buildup and Stuck Valves
 

Since I am doing a set of heads now. For a Customer. I am leaving you to you binky.

Re: Carbon Buildup and Stuck Valves
 

Never have I denied that! haha But you make a good one yourself sometimes. :lolsmack2:

Re: Carbon Buildup and Stuck Valves
 

YOUR* lol

Re: Carbon Buildup and Stuck Valves
 

'tis funny.
From what I can find on Castrol's site, they no longer manufacture "Syntec" it is now called "Edge". They replaced the Zinc with Titanium for better protection at higher heat. Some of the old car forums have been discussing the Zinc levels in Castrol Syntec 5-50....

What I am seeing reading all these oil company sites, and commentaries, is that the government regulations restricting the use of zinc has created the demand for titanium to replace it.

Actually quite interesting reads.

Hemmings has an article on which zinc formulations to look for, but it is out of date (2012). Apparently though Castrol was one of the first to use zinc, and as the amounts allowed were decreased they turned to other additives currently using titanium for the same effect. With the added bonus that apparently the titanium does not need the phosphorous, so the carbon buildup due to phosphorous in the oil isn't happening.

Re: Carbon Buildup and Stuck Valves
 

Interesting reading! Amsoil still has high zinc levels in their oil. One for break in purposes and the other for after break in. Even Hemmings oil has a higher zinc level than most. Joe Gibbs and others which i can't remember have zinc. The rotella 15w-40 I run in my 305 has zinc in it.

Re: Carbon Buildup and Stuck Valves
 

Yeah interesting about titanium being added to some oils! I have just been using a Rislone zddp additive along with Rotella 15-40 in my '72, Rotella with no additive in my '55 and I recently got a low miles engine for the '70. It was being run with Mobil 1 and a zddp additive so I plan on doing the same thing as it did it's first 30,000 on.

If it was already mentioned, ignore this comment, but from what I understand the primary reason for the EPA regs the feds implemented was that they claimed that the zinc damaged catalytic converters.

DAC

Re: Carbon Buildup and Stuck Valves
 

Getting to what you stated about the cat converter not being able to digest the zinc in the oil that was used in the V6's era - we can also include leaded gas - both plug up cats - lead and zinc are very close to being one of the same - look at babbit bearing material that was used - different ratios of both in different applications of engine usage. Zinc and lead are both excellent as a wear surface additives in oil - bearings surfaces and the bearing journals are cushioned by your oil. :winter:NOT HERE

Re: Carbon Buildup and Stuck Valves
 

Cat converters were a dumb idea to begin with. :banghead:

Re: Carbon Buildup and Stuck Valves
 

i hate catalytic converters too, but i remember all the smog in the air back in the 70's. i like the clean air better. so i guess i can deal with cat converters

Re: Carbon Buildup and Stuck Valves
 

Catalytic converters have come a long way, with hi flow converters today there is really no restriction. The smell of pre converter cars exhaust is annoying, I actually bought some high flow converter I'm going to try on my 68 478M.