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Search found 274 matches

by LSP
Sat Feb 15, 2020 3:38 pm
Forum: Engine Tech
Topic: Choosing a cam for a 363 SBF
Replies: 10
Views: 419

Re: Choosing a cam for a 363 SBF

Thanks for the reply LSP. I haven’t ordered the rings yet. I do plan on using the gas ported ones you suggested. What kind of spring rate would you suggest for my application? 100+ lbs. more rate, the PAC 1325 installed .100" from coil bind looks good to me if you do want to get in the 8500 rpm ran...
by LSP
Sat Feb 15, 2020 2:59 pm
Forum: Engine Tech
Topic: Choosing a cam for a 363 SBF
Replies: 10
Views: 419

Re: Choosing a cam for a 363 SBF

I have a set of lunati rods. They have ARP 2000 bolts Here’s the part number and card Those rods seem quite robust, your short block should be 8500 rpm capable. Did you ever order those rings? Those springs don't have enough rate for an average intensity roller profile with your valves at that rpm ...
by LSP
Sat Feb 15, 2020 12:02 pm
Forum: Engine Tech
Topic: Piston wrist pin length
Replies: 68
Views: 4161

Re: Piston wrist pin length

How thick is it in the center?
by LSP
Sat Feb 15, 2020 12:00 pm
Forum: Engine Tech
Topic: Choosing a cam for a 363 SBF
Replies: 10
Views: 419

Re: Choosing a cam for a 363 SBF

You mentioned wanting to spin it as much as possible, what connecting rods do you have?
by LSP
Sat Feb 15, 2020 10:18 am
Forum: Engine Tech
Topic: Minimum Cross Sectional Area: Question
Replies: 155
Views: 4842

Re: Minimum Cross Sectional Area: Question

GaryC what is the comparison of angle mill to raise compression or as a after thought? Steve, have you noticed those that build no actual real engines, or do any testing, and have no data of their own, are the most vocal opposition to those that do build real engines? Randy Be it on the dyno or the...
by LSP
Sat Feb 15, 2020 9:41 am
Forum: Engine Tech
Topic: Piston wrist pin length
Replies: 68
Views: 4161

Re: Piston wrist pin length

Street car, 5.0L, 93 octane pump gas, twin turbo, 8000 rpm fuel cutoff, 78.9mm stroke, probably about 800 lbf-ft torque over a fairly broad power band. Putting Subaru pistons in a V-8? They didn’t end up being Subaru pistons but custom pistons from another 100mm forging. The overlap between the pin...
by LSP
Thu Feb 13, 2020 5:16 pm
Forum: Engine Tech
Topic: Piston wrist pin length
Replies: 68
Views: 4161

Re: Piston wrist pin length

I’m looking at Mahle 100mm Subaru pistons with 23mm diameter piston wrist pins. The bare piston weighs 406g. The wrist pin is about 57mm long. The gap between pin bosses (for the rod small end) is about 29.5mm. This leaves about 13.75mm (0.54”) of pin inside the piston per side when the pin is perf...
by LSP
Thu Feb 13, 2020 12:28 pm
Forum: Engine Tech
Topic: 8.2 mexican block 338ci turbo piston ring land question
Replies: 11
Views: 357

Re: 8.2 mexican block 338ci turbo piston ring land question

Hi, I have a question, I have a set of 30cc dish pistons I can make work in a combo im wanting to turbo, can anyone tell me what their thoughts are of a .165 top ring land in a turbo application with forged pistons. I can make it an e85 dedicated build if required to make it live.... 338 cubes, 750...
by LSP
Thu Feb 13, 2020 7:27 am
Forum: Engine Tech
Topic: Piston wrist pin length
Replies: 68
Views: 4161

Re: Piston wrist pin length

I’m looking at Mahle 100mm Subaru pistons with 23mm diameter piston wrist pins. The bare piston weighs 406g. The wrist pin is about 57mm long. The gap between pin bosses (for the rod small end) is about 29.5mm. This leaves about 13.75mm (0.54”) of pin inside the piston per side when the pin is perf...
by LSP
Tue Feb 11, 2020 10:11 pm
Forum: Engine Tech
Topic: Why does a tighter lsa need more compression?
Replies: 140
Views: 4718

Re: Why does a tighter lsa need more compression?

Why. Is this thread still going.. And why do people care what your engine cranks for compression? Im not building air compressors.. Not sure but if any of the Credited Super Stock engine builders matter, they only focus on cylinder pressure and could care a less about compression ratio. The same co...
by LSP
Tue Feb 11, 2020 10:04 pm
Forum: Engine Tech
Topic: single compression ring piston
Replies: 32
Views: 1594

Re: single compression ring piston

I don't want my second ring to EVER try to control any amount of combustion pressure, that's why every motor I build gets more second ring and top oil rail gap than the top ring does, some A LOT more. You will be able to sleep peacefully knowing that your second rings will help control any combusti...
by LSP
Tue Feb 11, 2020 5:53 pm
Forum: Engine Tech
Topic: Why does a tighter lsa need more compression?
Replies: 140
Views: 4718

Re: Why does a tighter lsa need more compression?

GARY C wrote:
Sat Feb 08, 2020 6:39 am
Not sure but if any of the Credited Super Stock engine builders matter, they only focus on cylinder pressure and could care a less about compression ratio. The same could be said for boosted and nitrous applications.
What Super Stock engine builders focus on only cylinder pressure?
by LSP
Tue Feb 11, 2020 5:42 pm
Forum: Engine Tech
Topic: Piston ring question Napier second ring
Replies: 23
Views: 1015

Re: Piston ring question Napier second ring

Here are a couple pics of the pistons. Gas porting has been suggested, but I have a 1/16” top ring. Thoughts? CRG0690-5 and gas port the top ring - What I meant was to put the gas ports in the upper surface of the top ring itself, Total Seal can do that to any ring. Gas ports are of benefit to 1/16...
by LSP
Tue Feb 11, 2020 12:18 pm
Forum: Engine Tech
Topic: single compression ring piston
Replies: 32
Views: 1594

Re: single compression ring piston

This ^^^^^^^ is correct. Most piston ring manufacturers define the second ring as 80% oil control and 20% combustion pressure control. Which piston ring manufacturers claim that the 2nd ring controls 20% of the combustion pressure? All of them that I know of . . . . . . . . But you have misundersto...
by LSP
Tue Feb 11, 2020 12:15 pm
Forum: Engine Tech
Topic: Current NHRA Pro-Stock Cyl. heads
Replies: 10
Views: 1324

Re: Current NHRA Pro-Stock Cyl. heads

mt-engines wrote:
Tue Feb 11, 2020 8:34 am
mag2555 wrote:
Tue Feb 11, 2020 7:01 am
Your talking 500 cfm on the Intake and 330 out the Exh @ .900" lift pretty much.
LMFAO.... not even close to that little.
It was that little 25 years ago lol