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Search found 16 matches

by weedburner
Tue Nov 29, 2022 2:20 pm
Forum: Engine Tech
Topic: How will you go faster?
Replies: 265
Views: 5701

Re: How will you go faster?

The data you need to create a drag strip simulation is nearly impossible to nail down, especially considering a dyno session is not conducted under real world conditions. Put a data recorder in an actual car, then the car itself becomes the dyno. You won't get torque/hp numbers to play with, but you...
by weedburner
Thu Nov 24, 2022 12:12 pm
Forum: Engine Tech
Topic: How will you go faster?
Replies: 265
Views: 5701

Re: How will you go faster?

From my stick shift drag racing point of view, taking a torque@rpm number from a dyno session and multiplying it by gear ratio and tire diameter to get accel force only makes sense for a CVT. Because that method ignores the inertia effects of different engine acceleration rates on the engine's net t...
by weedburner
Thu May 19, 2022 10:13 am
Forum: Engine Tech
Topic: dropped base air cleaner
Replies: 30
Views: 1666

Re: dropped base air cleaner

I added a section to an existing drop base to make an extreme version... https://grannys.tripod.com/shopmulecrossbar4.jpg Had to get creative for a throttle cable bracket, but the extreme drop allows me to show someone the top of a stock looking Carter/Edelbrock 625 without revealing the Crosshair n...
by weedburner
Tue Apr 19, 2022 1:31 pm
Forum: Engine Tech
Topic: PCV vs EVAC
Replies: 76
Views: 5404

Re: PCV vs EVAC

I don't know if class racers have a limit as to how large of a catch can they can run, but a pre-evacuated tank could also add volume to serve as a short duration substitute for a vacuum pump :wink: Grant Like this? https://cdn.shopify.com/s/files/1/1426/4000/products/K9085-Kit_1024x1024.jpg?v=1542...
by weedburner
Tue Apr 19, 2022 12:24 pm
Forum: Engine Tech
Topic: PCV vs EVAC
Replies: 76
Views: 5404

Re: PCV vs EVAC

How much vacuum can you put on regular seals without causing problems? I've been running my pcv/sealed crankcase setup since 2012 with a couple different street/strip engines. Rear seal is a fluoroelastomer 2912 Felpro, which seems to last pretty good when installed backwards against 15-16" vacuum....
by weedburner
Tue Apr 19, 2022 12:13 pm
Forum: Engine Tech
Topic: PCV vs EVAC
Replies: 76
Views: 5404

Re: PCV vs EVAC

Grant, Maybe I missed it in your description, but how does your system keep oil from being drawn into the intake tract? I'm assuming that you have a hose connecting your adjustable PCV valve to manifold vacuum, either on the carb baseplate or the intake manifold itself. I'm very intrigued by your s...
by weedburner
Mon Apr 18, 2022 1:59 pm
Forum: Engine Tech
Topic: PCV vs EVAC
Replies: 76
Views: 5404

Re: PCV vs EVAC

Pulls 15-16" going down the highway, it's a street/strip car. Pcv doesn't draw a lot of volume, so the engine has to be sealed up pretty good for it to work. Not much vacuum in the intake tract to draw in the crankcase after going WOT, but you have a lot of crankcase volume (big pan helps), so it ta...
by weedburner
Mon Apr 18, 2022 12:51 pm
Forum: Engine Tech
Topic: PCV vs EVAC
Replies: 76
Views: 5404

Re: PCV vs EVAC

My point was that I previously used an electric pump as backup for the pcv valve crankcase vacuum source. Turned out the electric pump was not needed for my application, so I simplified the setup by eliminating the electric pump/separator/hoses. Moved the check valve inside a couple breathers, which...
by weedburner
Mon Apr 18, 2022 12:00 pm
Forum: Engine Tech
Topic: PCV vs EVAC
Replies: 76
Views: 5404

Re: PCV vs EVAC

I added some pics to the bottom of my above post, they show my previous system that featured a separator can. It featured an electric vac pump as back-up for the pcv valve. The check ball breather setup is lighter and works just as well. I'm no stranger to leaving at hi rpm, i'm the guy that invente...
by weedburner
Mon Apr 18, 2022 11:43 am
Forum: Engine Tech
Topic: PCV vs EVAC
Replies: 76
Views: 5404

Re: PCV vs EVAC

Here's some pics of the DIY pcv based evac system currently on the street/strip Shop Mule car. Here's what's inside a common stock pcv valve... https://grannys.tripod.com/evacpcv3.jpg I modified the valve by adding a long screw to the top of the valve's plastic elbow, which allows me to adjust the m...
by weedburner
Sat Apr 09, 2022 11:32 am
Forum: Engine Tech
Topic: Edelbrock carb tuning
Replies: 131
Views: 7803

Re: Edelbrock carb tuning

I too played with drilling the throttle blades on a Carter/Weber/Edelbrock style carb. I ended up going back to non-drilled blades, then adding a home brewed adjustable feature to a cheap off-the-shelf pcv valve. First I cut one apart to see what was inside... http://grannys.tripod.com/evacpcv3.jpg ...
by weedburner
Fri Feb 04, 2022 7:34 pm
Forum: Engine Tech
Topic: Pressure plate weight
Replies: 31
Views: 2036

Re: Pressure plate weight

Know what gives a clutch those either in or out characteristics? ... waay too much clamp pressure! Reduce it to around 1600lbs and that 6 pad would work just fine.

Grant
by weedburner
Fri Feb 04, 2022 10:33 am
Forum: Engine Tech
Topic: Pressure plate weight
Replies: 31
Views: 2036

Re: Pressure plate weight

How much torque are you planning to make with that 337" sbc? 3200lbs on that 6 paddle disc will draw over 900ftlbs out of the engine. Great for burnouts on street tires, bad for trans/rearend if you ever put sticky tires on it. About 1600lbs of clamp on that disc would be enough to hold a naturally ...
by weedburner
Mon Jan 31, 2022 4:27 pm
Forum: Engine Tech
Topic: Pressure plate weight
Replies: 31
Views: 2036

Re: Pressure plate weight

Sounds like a lot of pressure plate load, how much torque do you plan to make?

Here's a link to Ram's pressure plate page, it lists weights for the different types/sizes... https://ramclutches.com/pressure-plates/

Grant
by weedburner
Sun Jan 30, 2022 12:08 pm
Forum: Engine Tech
Topic: Pressure plate weight
Replies: 31
Views: 2036

Re: Pressure plate weight

Hi Little Mouse, I have a street/strip '85 Mazda RX-7 w/ 96" wheelbase that I installed an sbc/4spd into. Instead of extending the front, i moved the engine back 10" to get 2325lbs with 45%F/55%R distribution. Also made a street friendly torque arm style rear suspension, much safer than non-articula...