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Search found 264 matches

by Roundybout
Sun Mar 01, 2020 12:54 am
Forum: Engine Tech
Topic: How much zddp
Replies: 72
Views: 5276

Re: How much zddp

Does ZDDP need to be “replenished” after the initial break in period with a FT cam? I was under the impression during break in heat causes the ZDDP a form a protective layer protecting the surfaces. Is it a sacrificial later that is worn away?
by Roundybout
Thu Feb 27, 2020 7:48 pm
Forum: Engine Tech
Topic: Valve spring in use video
Replies: 9
Views: 1266

Re: Valve spring in use video

All the meticulous machining, careful measurement of clearances and tolerances looks to go out the window when I see videos like these. I’m amazed an engine lasts 5 mins lol. That top spring doesn’t appear to be rotating or at least very slowly. I believe they need to spin for even seat and valve ti...
by Roundybout
Thu Feb 27, 2020 2:04 pm
Forum: Engine Tech
Topic: 4 Questions - Isky Tool Room Springs VS Chrome Silicon & Titanium Retainers On Street Engine
Replies: 29
Views: 1713

Re: 4 Questions - Isky Tool Room Springs VS Chrome Silicon & Titanium Retainers On Street Engine

Is that 0.495” valve lift calculated with the 1.72:1 big block rockers? What is the goal with using light weight valve train components? To be able to use less spring? HP gain? Durability? All the above? With your self-imposed 5500 RPM or so limit I think you’d be fine using a steel retainer and wou...
by Roundybout
Sun Feb 09, 2020 2:56 pm
Forum: Engine Tech
Topic: Why does a tighter lsa need more compression?
Replies: 140
Views: 6289

Re: Why does a tighter lsa need more compression?

We are talking about static cam timing and how the valve events effect trapped pressure in the cylinder, how does variable valve timing play into this? You’re only going to get a certain amount of trapped cylinder pressure based on a static cam profile at any RPM. Now with VVT I can manipulate that ...
by Roundybout
Tue Feb 04, 2020 7:55 pm
Forum: Engine Tech
Topic: Need some help from the forum locating nitriding facility
Replies: 15
Views: 1352

Re: Need some help from the forum locating nitriding facility

I don’t know what you consider local (seems everything local to me is a 4-6 hour drive)
Few of the local racers use them. Very quick turn around too.

Mid-South Metallurgical
742 Old Salem Road
Murfreesboro, TN 37129
Tel: 615-896-6212
Fax: 615-896-6231
info@midsouthmet.com
by Roundybout
Sun Feb 02, 2020 1:11 pm
Forum: Engine Tech
Topic: Update to Yates Head Thread
Replies: 13
Views: 571

Re: Update to Yates Head Thread

That’s outstanding for 318 cid and a single 750 Holley.
by Roundybout
Fri Jan 31, 2020 5:41 pm
Forum: Engine Tech
Topic: Engine Masters
Replies: 87
Views: 2640

Re: Engine Masters

unfortunately you are wrong. the origin of the word motor is "to move" hence it is any mechanical device that causes something to move i.e. motion there is zero requirement for electricity to be involved I said that right above. Motor is movement. It doesn’t have to be electric. It doesn’t have to ...
by Roundybout
Fri Jan 31, 2020 5:33 pm
Forum: Engine Tech
Topic: ideas on ford 331
Replies: 21
Views: 876

Re: ideas on ford 331

That must be a lil screamer. 10:1? Possible it could handle another point of compression depending on what you plan on for a cam change? I know some people freak out with street driven often and solid roller in the same sentence but I think theres some power there also. Is that the gross cam lift wi...
by Roundybout
Fri Jan 31, 2020 5:08 pm
Forum: Engine Tech
Topic: Engine Masters
Replies: 87
Views: 2640

Re: Engine Masters

PRH wrote:
Fri Jan 31, 2020 4:54 pm
People arguing that the definitions of words in the dictionary are incorrect.

That’s classic internet logic right there.
It could be worse. I’m just glad we’re not on page 126 of the HP vs Torque debate lol.
by Roundybout
Fri Jan 31, 2020 5:02 pm
Forum: Engine Tech
Topic: Engine Masters
Replies: 87
Views: 2640

Re: Engine Masters

An engine uses heat or combustion to produce motion (simplified) where a motor uses electricity or hydraulic pressure to produce motion. Motor terminology is almost never interchangeable with the word engine. “electric motor” “brushless motor” “hydraulic motor” Substituting the word motor with engi...
by Roundybout
Fri Jan 31, 2020 4:54 pm
Forum: Engine Tech
Topic: 307 sbc
Replies: 31
Views: 5233

Re: 307 sbc

It was always a surprise opening the hood of any late 70s mid 80’s GM product and wondering if you were going to see an Oldsmobile in a Pontiac lol. There was a lot of brand interchange back then until the corporate Chevy took over. Will it be a 307 olds or Chevy? I never did anything with a 307 Che...
by Roundybout
Fri Jan 31, 2020 4:47 pm
Forum: Engine Tech
Topic: Engine Masters
Replies: 87
Views: 2640

Re: Engine Masters

An engine uses heat or combustion to produce motion (simplified) where a motor uses electricity or hydraulic pressure to produce motion. Motor terminology is almost never interchangeable with the word engine. “electric motor” “brushless motor” “hydraulic motor” Substituting the word motor with engin...
by Roundybout
Wed Jan 29, 2020 1:32 pm
Forum: Engine Tech
Topic: I think we should take a good look at the 445 Thunderjet
Replies: 36
Views: 3086

Re: I think we should take a good look at the 445 Thunderjet

That saw cut between the cylinders for cooling, how far does that go down the bore? I’d imagine that can’t be too good to maintain a round bore and ring seal with added cylinder pressure. Wouldn’t it also limit the bore size you could attain?
by Roundybout
Sat Jan 25, 2020 5:09 pm
Forum: Engine Tech
Topic: I think we should take a good look at the 445 Thunderjet
Replies: 36
Views: 3086

Re: I think we should take a good look at the 445 Thunderjet

Any thoughts why Ford chose port injection over direct for this clean-sheet design ? I would think the benefits of DI were heavily weighed for mileage and emissions advantages alone, especially for a truck engine. I have a feeling budget constraints also figured into the design. The position of the...
by Roundybout
Thu Jan 02, 2020 11:16 pm
Forum: Engine Tech
Topic: Piston pin coatings
Replies: 10
Views: 884

Re: Piston pin coatings

DLC coatings are only microns thick and used for their anti-friction/wear properties so they wouldn’t be much use in this clearance issue. The only things I’m comfortable with coating to make up clearance issues are pistons and possibly bearings.