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Search found 139 matches

by Mummert
Sat Oct 26, 2019 10:26 pm
Forum: Engine Tech
Topic: valve lock wedging
Replies: 6
Views: 506

Re: valve lock wedging

if you assemble a valve with locks in the retainer in your hands and pull on it should there be a really tight wedging action so that the retainer stays in place by itself and can support its own weight? i have some 7 degree locks and retainers and some wedge and others don't. all are 7 degree for ...
by Mummert
Sat Oct 26, 2019 8:17 pm
Forum: Engine Tech
Topic: Air flow vs valve size
Replies: 10
Views: 1386

Re: Air flow vs valve size

Is the valve the only area in a port that you should look at when considering flow coefficient?
Is it smart to use the valve as the determining factor for you flow coefficient if you feel that it is too big for operating range?
by Mummert
Thu Oct 24, 2019 7:42 pm
Forum: Engine Tech
Topic: Air flow vs valve size
Replies: 10
Views: 1386

Re: Air flow vs valve size

I don't see much wrong with a Stude combustion chamber, but I saw some heads on the Jalopy Journal and the exhaust valves are huge! What size are they in the cnc ported heads.
by Mummert
Mon Oct 21, 2019 2:40 pm
Forum: Engine Tech
Topic: Cam selection for budget 351w...splitting hairs
Replies: 6
Views: 408

Re: Cam selection for budget 351w...splitting hairs

Isky 256 and 264 mega work well, we ran a crane like that, bought it about 20 years almost identical specs, it was noisy, and would get louder the longer you drove it. We tried different amounts of preload, even replaced the lifters, pulled the old ones out and they looked perfect. I'm sure they are...
by Mummert
Sat Oct 19, 2019 4:40 pm
Forum: Engine Tech
Topic: Under performing 357 sbc
Replies: 33
Views: 1582

Re: Under performing 357 sbc

The heads stock only move about 290s cfm on my bench and for that size runner it makes them a turd velocity wise. You port them and really wake them up but then they are larger than what you can use. As they are now with your combo the heads are already borderline. The older hurricane intakes are n...
by Mummert
Thu Oct 17, 2019 3:26 am
Forum: Engine Tech
Topic: EMC 289
Replies: 65
Views: 2899

Re: EMC 289

Years back, we played with perfomers rpm, which I believe are the same as E-street but with better parts, and vic jrs,. I liked the performer rpms pre 2003' before they changed the casting, on smaller engines. If there is something to be learned from this whole project, what it takes to make 450 hp...
by Mummert
Wed Oct 16, 2019 4:17 pm
Forum: Engine Tech
Topic: Under performing 357 sbc
Replies: 33
Views: 1582

Re: Under performing 357 sbc

256-260 int, will get a 357 in the 72-7500 range with your style of head. the exhaust should be based off of the exhaust system. If your running headers and collecters only, about 5 degrees less exh duration will be pretty stout. If you start adding tail pipe or collecter extensions to it than you n...
by Mummert
Wed Oct 16, 2019 2:03 am
Forum: Engine Tech
Topic: Under performing 357 sbc
Replies: 33
Views: 1582

Re: Under performing 357 sbc

10 degrees less exhaust duration and a smaller intake runner with similiar flow would help. Weve done a fair bit of bracket racing out here and smaller ports with more air speed seem to be more consistent et wise throughout the year, even throughout the day. Its pretty common to get a 1000ft DA chan...
by Mummert
Tue Oct 15, 2019 2:22 pm
Forum: Engine Tech
Topic: Dual pattern cams in towing applications
Replies: 23
Views: 1397

Re: Dual pattern cams in towing applications

Headers, headers. If your exhaust works narrow up the lobe centers and and drop the exhaust duration. Last cam I had was 202@.050 on a 108 installed on a 102. It was to revvy. I was gonna try a 192@.050 on a 103 installed at 98. But the truck had so many miles and the front end was shot, needed ever...
by Mummert
Sun Oct 13, 2019 3:52 pm
Forum: Engine Tech
Topic: EMC 289
Replies: 65
Views: 2899

Re: EMC 289

. The bore was 4.041 filled by off the shelf JE SRP Pro flat top pistons. We played some games to get the ring tension down. Compression 10.47:1 Any thought given in using a zero-gap ring in an application like this ? I think regular are rings pretty near zero gap when the engine is running. But I ...
by Mummert
Sun Oct 13, 2019 1:36 pm
Forum: Engine Tech
Topic: EMC 289
Replies: 65
Views: 2899

Re: EMC 289

Years back, we played with perfomers rpm, which I believe are the same as E-street but with better parts, and vic jrs,. I liked the performer rpms pre 2003' before they changed the casting, on smaller engines. If there is something to be learned from this whole project, what it takes to make 450 hp ...
by Mummert
Fri Oct 11, 2019 8:52 pm
Forum: Engine Tech
Topic: EMC 289
Replies: 65
Views: 2899

Re: EMC 289

A V-8 is a pair of odd fire 4 cylinders hooked together to make an even fire 8. V-8 Tri-y work on a 270-450-270-450 basis, the other side is y'ed every other. This common for all 90* v-8's
by Mummert
Fri Oct 11, 2019 7:22 pm
Forum: Engine Tech
Topic: EMC 289
Replies: 65
Views: 2899

Re: EMC 289

Quick pic testing tri-y and home brew waterpump drive
by Mummert
Fri Oct 11, 2019 7:09 pm
Forum: Engine Tech
Topic: EMC 289
Replies: 65
Views: 2899

Re: EMC 289

The 68 four barrel heads as far as I know are just 289 heads with 302 numbers on them. The pan is a GT-350 replica pan standard Aviad part, so it has neat baffles and trap doors in it for road racing. My buddy Dave built a nice perforated metal shield that bolted to the main girdle, but thats about ...
by Mummert
Fri Oct 11, 2019 1:31 am
Forum: Engine Tech
Topic: engine masters live feed?
Replies: 45
Views: 2001

Re: engine masters live feed?

I quit using anti-sieze because it caused a lot of ignition problems. :( It could very well be, after testing I want to install the adapters in the heads permanently and treat the spark plugs more traditionally, still being in the testing mode I needed to be able to remove them and AB test. With lo...