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Topic Review (Newest First)
01-26-2012 10:36 PM
2fox I been haven that tci conv.with many different combos over the years combo before a ws build was a 580 14.6 bbc dart block.then decided to build a pump gas motor.at that time a had 4.11's with a spool.
I thought with A3.50 gear withvthe 10 inch converter would work together Good?
01-26-2012 09:32 PM
2fox
Update

Quote:
Originally Posted by 2fox
Ok i got a.489 BBC with.8-71 TBS blower got 2x.750 blower carbs also from TBS. Just got motor.fired up i had no vacuum lines hook up to the carbs
these carbs are boost ref power vavles.i found the nipple that pulls vac.through the vavle are these suposed.to be tied together.into the back of the blower manifold?

With no vac lines.hooked.up..shouldnt it run rich.?.which i think it is
would this.make my headders glow.red at.about 2000/2500 rpms?

This is my first blower carbed engine.

And for my trans. Mod valve.run it.to a full vac source off the base plate...did i need.to tee.them together on both carbs to the mod vavle..thanks
ok update.....got car running smooier but headders are stll.glown red.temp redingwith my gun reads 780 °goes higher but my gun dont go that high but thats with motor just revedup at 3000 and holding it steadt for 30 seconds..also tryed timing set at 8 btdc idle eith total.of 28 °max.idled smooth....them i set dist at 28° at idle motorsurged bad

it seem to back fire seen flame shoot out of drivers side pipe i pulled the plugs and that side all look.black..could this be because i dont have the vac. Lines run to the bottom of the intake to pick up vac and boost ..maybe lran cause boost is not opening not given it more fuel? Comp checked the drivers side sence plugs where out 130 psi remenber 8.2/1 ad the ca specs above...anyideas ?


Thanks scared to run it anymore 12% under driven with 93gas 2summit elect.pumps Bigger than the 110 holley blue pumps 2#8's out the two tsnk fittings fuel filters first then pumps.the y'sinto a#10 line up front to a mallory reg. Then #6's to the carbs
01-26-2012 09:16 PM
2fox I been haven that tci conv.with many different combos over the years combo before a ws build was a 580 14.6 bbc dart block.then decided to build a pump gas motor.at that time a had 4.11's with a spool.
I thought with A3.50 gear withvthe 10 inch converter would work together Good?
01-23-2012 04:43 AM
cobalt327
Quote:
Originally Posted by 2fox
The.transmission converter is.a.3800.stall speed.with.3.50 gearrs.with.Detroit locked.for.the.street .hopen for.some.low.10's.at least.got.32x17.50x15 mt et street dot slicks
I may be wrong, but that's an awful lot of stall for a blown BBC, IMHO. But that's really not your question. Best thing I could suggest is get the tune to a safe point and start track testing to dial it in unless you can buy some dyno time.

Quarter mile trap speed and ET along w/the other vehicle specs (mainly weight) is as good an indicator of real world HP as most anything. You have enough motor to run your numbers- the question comes down to chassis set up and traction.
01-23-2012 02:13 AM
2fox The.transmission converter is.a.3800.stall speed.with.3.50 gearrs.with.Detroit locked.for.the.street .hopen for.some.low.10's.at least.got.32x17.50x15 mt et street dot slicks
01-22-2012 07:50 PM
cobalt327 That CR is fine, my concern was that it may have been on the high side for running any real boost. No idea on the times, though. I'd imagine traction will be a problem. What's a "10 stall speed"?
01-22-2012 06:39 PM
2fox What should.this.car.run in the quarter mile. Has.3.50 gears with.dlocker 10 stall speed
01-21-2012 01:09 PM
2fox
Quote:
Originally Posted by cobalt327
What is the static compression ratio?
8.2to 1 compression flat.top srp's blower piston.heads.are.cced.at.122cc .010 in the hole.not.sure on head gasket thickness .042 ? Flat tops have -3cc
01-21-2012 08:49 AM
cobalt327 What is the static compression ratio?
01-21-2012 12:32 AM
2fox In pic.#3.the.big.plig at the rear.of the.cars.am going.to run it to the.vac mod. Valve.correct?

i need.to lock oit the.dost.like.you said ?.is that to much.i thought more.like.22/26.with.pump gas i might.have less boost then planned on .i as.set.up for 12%ud.but.that.was.with.srock iron heads.i got.345.cc.ingake.runners now.TBS.I might.noy see 8psi.bit less pulleys.are.59 /58 upper and.52/54 lower cant rember.but.of i only.see.say 5/6 psi .i will the.swap the.pullehs.and.od.ot.13.5.% i thinllk.

Let me know.if.am.rigth.or not.thanks
01-21-2012 12:24 AM
2fox Okay so my pic #5 the nipple.goes.to the.vacumm andbboost to the.bottom.of the intake.below.the.blower.correct
so when i fired.up my car.wirhout.rhe.ref.nipple.hooked uo the.power valve.so open or.closed.?.. I think.the.boost ref. Carbs.it.dont.get.a.vac.signal.to the.power.valve.so it.would.run rich correct my.plug are.black.
So of.i hookthem up the.nipple.the.the.boost.ref. It will get vac.closing the.power valve.then when it.gets.boost.it.willpush.the.power.valvw.open to get more.fuel correct?
01-20-2012 05:58 AM
F-BIRD'88 ya thats a big cam.
Lock out the distributor curve.

NO boost retard box = 28 to 32deg timing.

with boost retard box 38deg timing, reduce to 28-32 when under boost WOT
01-19-2012 07:44 AM
2fox Cam is a comp cam blower grind
255/262 @.050. Lift is .652 on both. On a 114 lash is .020 .
O got.dart.pro1s rect.port 345 cc intake.runners

is.that a big cam.and heads .thanks man u been big help can i call you still dont fully still dont understand pm.me.with.# of.you dont mind thanks Gary
01-19-2012 05:42 AM
F-BIRD'88 No the power valve goes to the intake manifold only.

Never to the base of the carb or any where above the blower.

You do not want vacuum acting on the power valve when the motor is WOT under boost. This would close the power valve @WOT and burn the motor up.

Start with the idle eze closed. Give it all the spark timing it needs at idle.
Make sure both carbs throttles are open correctly at idle, and the same amount.
(idle fuel transfer slot exposure) Flip the carbs over and look and preset them , before install.

The idle eze will only be needed if the cam is huge., if at all.
01-18-2012 05:55 PM
2fox ok heres my 68 chevelle i need help on pic 1



pic 2


pic 3


pic 4


pic 5


pic 6
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