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Search found 766 matches

by ClassAct
Thu Sep 29, 2022 1:48 pm
Forum: Engine Tech
Topic: Oil pickup tube
Replies: 5
Views: 245

Re: Oil pickup tube

The Moroso pickup needs to be .250 away from the pan. The OE AMC pickup needs to be touching the pan. You shouldn’t have to crank the pan down with the bolts, but it should be an interference fit. They both will work.
by ClassAct
Tue Sep 27, 2022 6:47 am
Forum: Engine Tech
Topic: What's better A timing chain setup or a gear drive setup
Replies: 15
Views: 750

Re: What's better A timing chain setup or a gear drive setup

Tom68 wrote: Mon Sep 26, 2022 10:58 pm
ClassAct wrote: Mon Sep 26, 2022 10:31 pm

Do you have a link to that paper? The one I found tha I think was by Roush only tested a dual idler gear drive.
I have the paper somewhere, don't know if it's online.
Would you mind (if you can find the paper) taking a look at it and letting me know what gear drive(s) we’re tested?

TIA
by ClassAct
Mon Sep 26, 2022 10:32 pm
Forum: Engine Tech
Topic: What's better A timing chain setup or a gear drive setup
Replies: 15
Views: 750

Re: What's better A timing chain setup or a gear drive setup

I know a belt drive is the best, but I had a buddy over today asking me why I was selling my cam gear drive setup for a BBC. I asked "why? is there something wrong with a chain setup?" Me personally, I had always thought there were to many harmonics with a gear drive even though the noisy ones soun...
by ClassAct
Mon Sep 26, 2022 10:31 pm
Forum: Engine Tech
Topic: What's better A timing chain setup or a gear drive setup
Replies: 15
Views: 750

Re: What's better A timing chain setup or a gear drive setup

Roush tested the various cam drives, there's an SAE Paper on it. Didn't test belts, rejected for low tensile strength. HyVo type chain sucked up the least power from memory. Paper would be mid to late 90's. Do you have a link to that paper? The one I found tha I think was by Roush only tested a dua...
by ClassAct
Thu Sep 22, 2022 2:03 pm
Forum: Engine Tech
Topic: 128 my take, anybody see it like this ?
Replies: 158
Views: 4168

Re: 128 my take, anybody see it like this ?

307 601 10.5CR.png I reduced CR to 10.5 and i did the calculus based on my new input Peak Power RPM which match the previous DCR. Now the program output 108 LCA, but its also 108hp down :D I like all the parameters for 12CR. I dont know is it doable using 305 iron heads, flat top pistons and .43lif...
by ClassAct
Thu Sep 22, 2022 2:01 pm
Forum: Engine Tech
Topic: 128 my take, anybody see it like this ?
Replies: 158
Views: 4168

Re: 128 my take, anybody see it like this ?

355" SBC 10:1 with ported 492 heads, Performer RPM, and Holley 600. RPM---TQ--BHP 3200--436--266 3400--443--287 3600--445--305 3800--444--321 4000--443--337 4200--440--352 4400--440--368 4600--441--386 4800--441--403 5000--432--411 5200--422--418 5400--412--423 5600--400--426 The cam is 216/220, on...
by ClassAct
Thu Sep 22, 2022 11:16 am
Forum: Engine Tech
Topic: Does quench affect power?
Replies: 262
Views: 7510

Re: Does quench affect power?

We’re all not building street strip engines here or are interested in that. A bunch of you need to expand your horizons. Why are you even here and posting in this thread? Like, if you guys want to build historic engines with like 20% brake thermal efficiency, have at it. It’s fun, but this discussi...
by ClassAct
Thu Sep 22, 2022 11:11 am
Forum: Engine Tech
Topic: 128 my take, anybody see it like this ?
Replies: 158
Views: 4168

Re: 128 my take, anybody see it like this ?

hmmmm 307 601.png 12:1 is outside of the operating parameters of the 128 rule. LSA will widen according to the 128 rule and on which TM is based. Do the same specs with 10.5:1 and post up. 307 601 10.5CR.png I reduced CR to 10.5 and i did the calculus based on my new input Peak Power RPM which matc...
by ClassAct
Thu Sep 22, 2022 11:08 am
Forum: Engine Tech
Topic: 128 my take, anybody see it like this ?
Replies: 158
Views: 4168

Re: 128 my take, anybody see it like this ?

When you read DV's books and select the overlap as per the overlap pie chart for the intended application RPM and build level. and apply the 128 formula for that engine you get a camshaft duration. (within a workable relevent range) Mostly biased for a single pattern camshaft. You can then tweek th...
by ClassAct
Thu Sep 22, 2022 11:03 am
Forum: Engine Tech
Topic: Does quench affect power?
Replies: 262
Views: 7510

Re: Does quench affect power?

Most of what I quoted is NASCAR, which applies to most any two valve engine :roll: . If you want to make an engine as efficient as possible, and extract every last drop of chemical energy out of gasoline, run it to 0.1mm (in a firing engine, accounting for stretch, thermal expansion, etc) The NASCA...
by ClassAct
Tue Sep 20, 2022 7:54 pm
Forum: Engine Tech
Topic: 128 my take, anybody see it like this ?
Replies: 158
Views: 4168

Re: 128 my take, anybody see it like this ?

I think the first thing people need to do is to create a histogram rpm plot on how they drive. We use 104-106 LSA (104/104 centerlines, or around 102/106 centerlines) on road race engines. Work great, make a lot of power for something that redlines around 7200rpm, but no way would I call that stree...
by ClassAct
Tue Sep 20, 2022 12:36 pm
Forum: Engine Tech
Topic: 128 my take, anybody see it like this ?
Replies: 158
Views: 4168

Re: 128 my take, anybody see it like this ?

Most of my stuff is 11-12:1 pump gas and I haven’t used over a 108 LSA on any of them. My own engine is on a 105 in at 105. None of them are bad or hard to drive on the street. They idle clean and will idle down to 700 if I let them. That’s GM, Ford and Chrysler small and big block. My engine will ...
by ClassAct
Tue Sep 20, 2022 11:46 am
Forum: Engine Tech
Topic: 128 my take, anybody see it like this ?
Replies: 158
Views: 4168

Re: 128 my take, anybody see it like this ?

Most of my stuff is 11-12:1 pump gas and I haven’t used over a 108 LSA on any of them. My own engine is on a 105 in at 105. None of them are bad or hard to drive on the street. They idle clean and will idle down to 700 if I let them. That’s GM, Ford and Chrysler small and big block. My engine will ...
by ClassAct
Tue Sep 20, 2022 11:16 am
Forum: Engine Tech
Topic: 128 my take, anybody see it like this ?
Replies: 158
Views: 4168

Re: 128 my take, anybody see it like this ?

When i looked at this in ENGMOD4T this seemed to be reasonable provided you were only looking at WOT maximum average power in the 3-7k rpm range. I think this is also fundamental to the rule. Although, peak torque may be more of an emphasis. The average would fall into place. Of course, there are e...
by ClassAct
Mon Sep 12, 2022 8:12 am
Forum: General Tech
Topic: JKM Flow Bench
Replies: 7
Views: 257

Re: JKM Flow Bench

Hi guys, I have a JKM600 flow bench that I just can't figure out what to do, I got a vacuum hose diagram off the internet and it looked like mine were installed wrong so I changed them to match the diagram, no luck, I think I just made it worst, can anyone that can help? @fastvette PM him and see i...