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Search found 921 matches

by piston guy
Mon Nov 23, 2020 5:08 pm
Forum: Engine Tech
Topic: Big Issues with Cylinder Pressure (DCR)
Replies: 84
Views: 2075

Re: Big Issues with Cylinder Pressure (DCR)

David , How do you establish what combination of CR and octane is safe? Heat is obviously generated as fuel and air are compressed , no argument. Controlling air inlet and fuel temperature helps decrease probability of detonation along with chamber shape again no argument. We all know you can't run ...
by piston guy
Mon Nov 23, 2020 12:31 pm
Forum: Engine Tech
Topic: Big Issues with Cylinder Pressure (DCR)
Replies: 84
Views: 2075

Re: Big Issues with Cylinder Pressure (DCR)

Static is still static and the limiting factor. Adjusting cam timing events does change cranking pressure , but that's nowhere near combustion pressure which is what we are worried about.
by piston guy
Fri Nov 20, 2020 4:28 pm
Forum: Engine Tech
Topic: Piston pin "end play" ? How much is ok ??
Replies: 19
Views: 781

Re: Piston pin "end play" ? How much is ok ??

Bill , Wire lock applications always end up with end play because the lock has have enough space to go into the groove and once it snaps down into the groove "some" end play results. "I" see .015 as a minimum and have run as much as .050. .125 is IMHO too much and a .050-.100 longer pin should be us...
by piston guy
Thu Nov 19, 2020 1:25 pm
Forum: Engine Tech
Topic: Small cams on 106-108 LSA’s
Replies: 47
Views: 2107

Re: Small cams on 106-108 LSA’s

In the '70s it was Racer Brown that "woke me up" regarding "cubic inches , air flow , and RPM" when looking for a camshaft. I had a Boss 302 and fell into "too little , too much and too broad" . It took three tries but we ended up with a "tight", moderate duration , very high lift ( for the day) to ...
by piston guy
Fri Nov 06, 2020 2:03 pm
Forum: Engine Tech
Topic: Balancing Experts....
Replies: 12
Views: 668

Re: Balancing Experts....

Balancing an engine as if it were a Swiss watch is a joke. If you "equalized" the force generated by all eight cylinders ( virtual impossibility) through out the engine's full rpm range , it might be worth it. You would also have to eliminate the torsional harmonics generated ( a watch doesn't have ...
by piston guy
Tue Nov 03, 2020 1:40 pm
Forum: Race Cars & Parts - For Sale or Wanted
Topic: Wanted ford distributor
Replies: 4
Views: 1821

Re: Wanted ford distributor

If 1972ho doesn't take it I would like to buy it. Please PM cost
by piston guy
Mon Nov 02, 2020 5:16 pm
Forum: Vintage/Classic/Historical Engine Tech
Topic: My next debate: origins of the canted valve Ford cylinder head.
Replies: 42
Views: 1357

Re: My next debate: origins of the canted valve Ford cylinder head.

Actually I think the 351 GT engines were already being tested early in 1968. These were the forerunners of the production 351 Cleveland I believe. More like '67 for the initial design stuff. The Ford engineers knew they had something with the 351GT engine design , but internal politics led to the u...
by piston guy
Mon Nov 02, 2020 4:59 pm
Forum: Engine Tech
Topic: Intake valve failure
Replies: 16
Views: 708

Re: Intake valve failure

I offer the "opinion" that the (stainless?) valve "weight" slamming back on the seat with 300lbs of seat pressure is trying to pull the "center" out of the valve . Flex is the most common cause of valves cracking. The bigger they are in diameter the greater the effect. I have only had one valve do t...
by piston guy
Wed Oct 28, 2020 4:32 pm
Forum: Vintage/Classic/Historical Engine Tech
Topic: Question about modern technology cam for Early FordFlat Head
Replies: 26
Views: 2676

Re: Question about modern technology cam for Early FordFlat Head

Tell me if I am wrong here, but I thought Ford "Y"-blocks used like roofing nail lifters?? Suckers had to come out of the bottom of the block.. So how do you use them in a SBF engine?? Now if you are just talking about the diameter of the foot, then fine??? pdq67 Mushroom lifters were made in '69 f...
by piston guy
Thu Oct 22, 2020 1:27 pm
Forum: Vintage/Classic/Historical Engine Tech
Topic: South America Jeep Tornado SOHC engine
Replies: 18
Views: 844

Re: South America Jeep Tornado SOHC engine

I heard one aftermarket company has made a couple sets of pistons for them.
by piston guy
Wed Oct 21, 2020 2:12 pm
Forum: Engine Tech
Topic: Engine Oil
Replies: 28
Views: 1518

Re: Engine Oil

So are you saying there is no Santa Claus too? Yes I am very aware of racers / teams NOT using the products that their car decals display. Being in the industry I've seen it for thirty years. I had to deny some contingency requests in Nascar more than once because I knew the requestor was not runnin...
by piston guy
Wed Oct 21, 2020 11:31 am
Forum: Engine Tech
Topic: Engine Oil
Replies: 28
Views: 1518

Re: Engine Oil

Sure looked like MOBIL1 sticker on Kyle Busch's car at Kansas last weekend.
by piston guy
Tue Oct 20, 2020 10:41 am
Forum: Engine Tech
Topic: Engine Oil
Replies: 28
Views: 1518

Re: Engine Oil

If Driven is SO good why does Joe Gibbs Racing run MOBIL1 now?????
by piston guy
Fri Oct 09, 2020 11:41 am
Forum: Engine Tech
Topic: 427 tall deck help
Replies: 16
Views: 683

Re: 427 tall deck help

There is a tall deck ( marine) rectangular port , aluminum GM intake for this application usually fairly cheap at swap meets
by piston guy
Thu Oct 01, 2020 11:24 am
Forum: Engine Tech
Topic: Piston oil ring support rails
Replies: 3
Views: 291

Re: Piston oil ring support rails

Bill ,
Hastings "groove lock spacers" do not have the "dimple" . Those come from Smalley Mfg. who also does Spirolocks and wirelocks to the industry.