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Search found 94 matches

by Mikej26
Wed Mar 03, 2021 11:15 pm
Forum: Engine Tech
Topic: Any downsides to anti reversion mufflers/devices?
Replies: 77
Views: 5710

Re: Any downsides to anti reversion mufflers/devices?

Has anyone measured flow in both directions to determine the difference in flow? I did this once for an intake manifold device, intuitively it looked like it might be AR, the flow difference was insignificant. I ordered a pair of the 3" in /3". Out. Since they were all Dynatech had in stainless. It...
by Mikej26
Mon Mar 01, 2021 2:21 am
Forum: Engine Tech
Topic: Any downsides to anti reversion mufflers/devices?
Replies: 77
Views: 5710

Re: Any downsides to anti reversion mufflers/devices?

For those guys who just HAVE TO buy a cam to get that "classic" lumpy idle, small and fast-enough headers and AR mufflers seem like a good idea, so I have to ask: Do these AR devices reduce the lumpy idle sound? (That could be a "downside" for some people.) (Is the sound primary driven by OVERLAP o...
by Mikej26
Sun Jan 03, 2021 12:00 am
Forum: Engine Tech
Topic: noisy sbc valvetrain
Replies: 15
Views: 1029

Re: noisy sbc valvetrain

The missing disc in one would’ve been grounds for me to just replace all of them while it was apart. But I’m completely guilty of trying to make stuff work when I have my doubts so no judgment from me
by Mikej26
Sat Dec 26, 2020 3:07 pm
Forum: Engine Tech
Topic: Simple idea for AR chamber off header collector
Replies: 30
Views: 1666

Re: Simple idea for AR chamber off header collector

Adding to my above comment. The AR devices I included in the pics are 3” inlet and outlet, but the internal portion tapers down to 2 1/2”.
by Mikej26
Fri Dec 25, 2020 10:17 pm
Forum: Engine Tech
Topic: Simple idea for AR chamber off header collector
Replies: 30
Views: 1666

Re: Simple idea for AR chamber off header collector

I placed my AR devices at the inlet side of my x pipe so that I still had a good amount of collector extension ahead of it.Image[/img]
by Mikej26
Thu Aug 13, 2020 3:17 am
Forum: Engine Tech
Topic: intake manifold vs intake gasket coverage
Replies: 12
Views: 606

Re: intake manifold vs intake gasket coverage

You can raise the manifold up by using a 1266 gasket which is thicker instead of a 1206. Will give you a better seal width up top. Be mindful that you check to see if you’re still sealing at the bottom of the port.
by Mikej26
Sun May 10, 2020 3:20 pm
Forum: Engine Tech
Topic: rear power valve on HP holley should i run one ?
Replies: 37
Views: 5063

Re: rear power valve on HP holley should i run one ?

...I think the one above has that plastic extension where the Speedway Motors doesn’t have that, so maybe that’s why its a bit more...but 3x’s more it better come highly polished... That looks like the vent whistle that most HP metering bodies include. Another cap is in the lower right of the pic. ...
by Mikej26
Wed Mar 04, 2020 11:01 pm
Forum: Engine Tech
Topic: Copper head gaskets
Replies: 13
Views: 1600

Re: Copper head gaskets

I’m currently running a set of copper mr gasket head gaskets on my sbc without o-rings. Stock deck height so I wanted something thin. Copper sprayed them thoroughly and haven’t had any issues.
by Mikej26
Wed Mar 04, 2020 10:56 pm
Forum: Engine Tech
Topic: Engine Masters rod ratio test results
Replies: 162
Views: 14954

Re: Engine Masters rod ratio test results

Didn't see the tests...what are the bsfc's for each and is there an average given or just peaks? They tested for that, but didn’t disclose the information. So either it was insignificantly different or they felt that presenting that info would be going too far into the weeds for the general audienc...
by Mikej26
Wed Mar 04, 2020 12:48 pm
Forum: Engine Tech
Topic: Engine Masters rod ratio test results
Replies: 162
Views: 14954

Re: Engine Masters rod ratio test results

What I found of interest was the difference in ignition timing requirements. The longer rod ran best in the 34-38* advance range and the short rod ran best in the 40-42* range. What got my attention and had me scratching my head is they said the long rod was insensitive to timing and ran the same f...
by Mikej26
Mon Mar 02, 2020 10:03 pm
Forum: Engine Tech
Topic: Engine Masters rod ratio test results
Replies: 162
Views: 14954

Re: Engine Masters rod ratio test results

What I found of interest was the difference in ignition timing requirements. The longer rod ran best in the 34-38* advance range and the short rod ran best in the 40-42* range. What got my attention and had me scratching my head is they said the long rod was insensitive to timing and ran the same fr...
by Mikej26
Sat Feb 01, 2020 1:41 pm
Forum: Engine Tech
Topic: Does fuel movement in bowls during acceleration impact AFR?
Replies: 28
Views: 1469

Re: Does fuel movement in bowls during acceleration impact AFR?

Even if the jets remain covered and regardless of what is happening with the float and needle and seats, wouldn’t the relative increase in fuel level at the front metering block and the decrease in the fuel level at the rear metering block directly affect the emulsion circuit. As well as provide a ...
by Mikej26
Fri Jan 31, 2020 11:46 pm
Forum: Engine Tech
Topic: Does fuel movement in bowls during acceleration impact AFR?
Replies: 28
Views: 1469

Re: Does fuel movement in bowls during acceleration impact AFR?

Even if the jets remain covered and regardless of what is happening with the float and needle and seats, wouldn’t the relative increase in fuel level at the front metering block and the decrease in the fuel level at the rear metering block directly affect the emulsion circuit. As well as provide a i...
by Mikej26
Thu Jan 23, 2020 8:08 pm
Forum: Engine Tech
Topic: Morel 4602 hydros
Replies: 3
Views: 665

Re: Morel 4602 hydros

Hi guys, i want help , i assembling a 406 sbc and might have an issue with the tall body 4602 morel lifters. it is very Close from the oilband to the edge of lifter bore at full lift , when i measure its like .175" ( 4.5 mm) until the lifter is "out of the bore" sort of speak ,, the camlift is: 577...
by Mikej26
Mon Jan 20, 2020 9:47 pm
Forum: Engine Tech
Topic: When are Offset Lifters Needed ?
Replies: 16
Views: 1966

Re: When are Offset Lifters Needed ?

Offset lifters introduce a torsional/rotational load on the lifter that doesn’t exist when the pushrod cup is centered. Personally I’d avoid adding the extra element of stress unless it was absolutely required to make the setup functional.