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Search found 626 matches

by RCJ
Tue Dec 10, 2019 6:08 am
Forum: Engine Tech
Topic: Port texture and velocity
Replies: 24
Views: 1706

Re: Port texture and velocity

Does the boundary layer have any insulation properties?
by RCJ
Mon Dec 09, 2019 1:58 pm
Forum: Engine Tech
Topic: Port texture and velocity
Replies: 24
Views: 1706

Re: Port texture and velocity

I'm working with and engine that by rule has a primary header smaller than the exhaust port.My thinking was that texturing the exhaust port would increase velocity thru the center of the port.Because of the small header I'm not using the whole port anyway. Didn't work , small lose in power over poli...
by RCJ
Fri Dec 06, 2019 6:05 am
Forum: Engine Tech
Topic: Port texture and velocity
Replies: 24
Views: 1706

Port texture and velocity

When going from a smooth port to a textured port, does the average velocity change?
by RCJ
Mon Dec 02, 2019 10:38 am
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 272
Views: 7466

Re: when are 3/4 grooved main bearings needed for bbc ?

If you take it one step farther, how much of the standard 180 degree groove is being used or could be eliminated.
by RCJ
Mon Nov 25, 2019 12:43 pm
Forum: Engine Tech
Topic: Hei ignition system questions.
Replies: 6
Views: 445

Re: Hei ignition system questions.

I installed a msd6 on a 350 sbc that made a round 330hp.It was a daily driver, I couldn't feel any change.
I had a 680hp race motor on the dyno.Took the msd off and put an HEI on it.I don't remember how much but it lost power(20hp maybe).
by RCJ
Thu Nov 21, 2019 12:45 pm
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 272
Views: 7466

Re: when are 3/4 grooved main bearings needed for bbc ?

180 on the thrust, so all the oil bleeding off at the parting line can oil the thrust?
If you were trying to reduce the amount of oil required by the rods, would coatings on the bearing or journal be of any benefit?
by RCJ
Mon Nov 04, 2019 12:50 pm
Forum: Engine Tech
Topic: Reputable links for horsepower from windage tray/crank scraper
Replies: 246
Views: 9876

Re: Reputable links for horsepower from windage tray/crank scraper

One of my favorite dyno stories.We were racing a spec head and intake oval track class .They had a bbc on the dyno before mine and I was helping tune it.It had a 1970s scorpion style intake on it,they had a extra intake in the shop, I switched it out.Picked up 20hp everywhere.I told the owner of the...
by RCJ
Tue Oct 29, 2019 6:11 am
Forum: Engine Tech
Topic: 305 head flow possibilities?
Replies: 52
Views: 2394

Re: 305 head flow possibilities?

With a 55cc chamber you will get around 11 c/r.The first time I used 305 heads on a 350 I detonated it and hurt some pistons.I switched from 91 to av gas, no problems after that. A butt dyno is calibrated to like throttle response and low speed torque ,which is fun, but the vortecs are going to win ...
by RCJ
Sat Oct 26, 2019 10:36 am
Forum: Engine Tech
Topic: C8 Corvette dynos high???
Replies: 26
Views: 1187

Re: C8 Corvette dynos high???

With vette vs. Dually you will save enough money in fuel cost you can stay home on snowdays.
by RCJ
Fri Oct 18, 2019 6:18 am
Forum: Engine Tech
Topic: Coating Air cooled pistons
Replies: 42
Views: 1649

Re: Coating Air cooled pistons

Grump and Smokey knew what they were doing, but some of the stuff they were doing was because of 1960s technology .Getting the oil hot might of helped more than anything.After we get the best power out of a motor, sometimes we make a "Hero" pull.Dump the water out and refill with cold water as fast ...
by RCJ
Fri Oct 18, 2019 6:07 am
Forum: Engine Tech
Topic: Intake choices for a mild, low-comp. 355
Replies: 21
Views: 975

Re: Intake choices for a mild, low-comp. 355

I would switch the 3310 holley out for a quick fuel carb.We raced in a class that required a performer intake and a 650 made more power than a 750.
by RCJ
Tue Oct 15, 2019 8:14 am
Forum: Engine Tech
Topic: 305 head flow possibilities?
Replies: 52
Views: 2394

Re: 305 head flow possibilities?

That is the cam we used , but by rules we had to use a stock Q jet intake. An RPM performer and some head work should extend the useable rpm range enough to use more cam.
by RCJ
Mon Oct 14, 2019 12:36 pm
Forum: Engine Tech
Topic: 305 head flow possibilities?
Replies: 52
Views: 2394

Re: 305 head flow possibilities?

We used those heads 20 years ago it a claimer style dirt track class.They would get a 350 to around 11 c/r,the 1.84 heads ran a lot better than the 1.72.If you are going as cheap as possible they seem to be a good heads.We were only turning about 5200 to 5500rpm
by RCJ
Fri Oct 04, 2019 8:06 am
Forum: Engine Tech
Topic: Coating Air cooled pistons
Replies: 42
Views: 1649

Re: Coating Air cooled pistons

Besides coating, how are other ways to pull the heat out of pistons.
by RCJ
Wed Oct 02, 2019 3:14 pm
Forum: Engine Tech
Topic: Coating Air cooled pistons
Replies: 42
Views: 1649

Re: Coating Air cooled pistons

If the coating are reducing heat transfer to the pistons, where is that heat going?Is the chamber staying hotter and heating the income fuel and air?I've been working with small air cooled motors and am see a reduction it hp as the motor gains temp ,trying to figure out which direction to go.