MG Midget

[Guest]

I never understood the point of a track less than 1/4 mile in length. 1/4 or longer is going to really put the vehicle thru the tests.

I agree, the only reason I don't go to a longer than 1/4 mile track is because we don't have any around here. I'd love to do the 1/2 or 1 mile sprints.

[caffeine]

The S10 clutch we used started slipping badly last week. Likely it just needed a longer break-in period. However, instead of just fixing the problem, we improved the car further . On the weekend we traded engines with my Fiero. So now it has a big N/A cam (which dynoed at 256whp in my Fiero) and also an 8 lb Fidanza flywheel with the Clutchnet 6-puck I ran in my Firebird last year.

Trans tunnel was modified a bit for the new shifter location and it got a Cosmo racing short shifter.


Oil filter relocation kit installed. Still a tight fit with the steering linkage but better than using a dented oil filter .

[pocket-rocket]

Looks good, but I would have run the filter vertical for cleaner oil changes.

Also my Rangers filter is horizontal like that and it tends to drain back into into the engine causing dry starts so I've gotten a 90* adapter from a 5.0 in the yard, I just need to figure up the banjo bolt since it wasn't long enough to work.

I'm guessing the pic with the steering linkage I'd upside down, so that would mean yours would have to go uphill to drain back.

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[caffeine]

Ya it would have to go uphill to drain back. That filter location was the best spot that worked with the supplied lines

[1988GTU]

Drain back shouldnt be an issue if you use a filter with the drain back valve built in. Napa, Wix, M1, I think Puroleaker all have it. Fram does not. With ACD's new design, I am unsure.

[caffeine]

Went to the 384' track today and it ran well.

Idle is way nastier with this cam

Final run/best time of the day

Pretty consistently 1.8 sec. 60-fts. I'm pretty sure they're a bit high because the 1-2 shift happens before the 60-ft mark.
Best run was 5.596 @ 72.34 MPH. 5.096 330 ft. time.

This was all on street tires since there's no driveshaft safety loop installed yet.

[shapeshaver]

Awesome build but I see 1 major issue...

if you place the o2 after or next to the slash cuts you get a false lean condition on the o2 sensor. you need to move the o2's further up in the stream or the slashcuts further down.

Sorry for my ignorance, but what is the function of a "slash cut"?

[caffeine]

The idea is you can use exhaust flow to develop a vacuum in the crankcase at higher rpm. This in turn aids oil return and piston ring sealing. Pulling a vacuum in the crankcase at WOT has been dyno proven to increase hp.

[ForcedFirebird]

And it keeps the water vapor out of the oil

Every time you shut your engine off, it's the reverse effect of a cold soda sitting outside and condensation builds. So, when it warms back up it turns from fluid water back to vapor and a vacuum source will evacuate it. We have done a lot of builds, and always retain crankcase vacuum, it's just better all the way around (not just power).

[shapeshaver]

The idea is you can use exhaust flow to develop a vacuum in the crankcase at higher rpm. This in turn aids oil return and piston ring sealing. Pulling a vacuum in the crankcase at WOT has been dyno proven to increase hp.

And it keeps the water vapor out of the oil

Interesting! So what is the optimal cut shape, angle to exhaust flow, depth, and pipe diameter to get the best venturi effect without creating an exhaust flow restriction?

[Superdave]

45 degrees, 45 degrees, center of the pipe, about 1/2" to 3/4" pipe with a check valve.

There is debate about the tip angle to the pipe, I did mine like the top and it worked for sure.




the kits from Summit work well.

[shapeshaver]

Got it, thanks!