Engine Vacuum - Team Camaro Tech
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post #1 of 15 (permalink) Old Jan 20th, 01, 02:04 PM Thread Starter
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hi guys:

I have a 1968 camaro, that i just did a power front disc brake conversion. my problem is, im not getting enough vacuum to the brake booster. I need a minimum of 16" hg at idle. i can only generate 10" hg. I am taking vacuum from the # 8 intake runner. What are my options ???

Engine: 350
Intake: dominator II
Carb: 4150 double pumper

Thanks Im greatful for your help.
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post #2 of 15 (permalink) Old Jan 20th, 01, 02:21 PM
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I have a similiar situation with my BB> I have an ELECTRIC vaccum pump from http://mpbrakes.com. It is expensive but it works great.



[This message has been edited by sr71bb (edited 01-20-2001).]
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post #3 of 15 (permalink) Old Jan 20th, 01, 02:40 PM Thread Starter
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thanks sr71BB

It is expensive, but also a sollution.

Many thanks for your help
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post #4 of 15 (permalink) Old Jan 22nd, 01, 08:20 AM
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Look in Summit or Jegs and get a vaccum canister. Only costs around $70



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post #5 of 15 (permalink) Old Jan 22nd, 01, 10:41 AM
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Check this one out. A buddy of mine got one and it solved his problem.
http://www.herbertperformance.com/Ca...eservoirs.html



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'69 getting better every day... (every pay day)
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post #6 of 15 (permalink) Old Jan 22nd, 01, 10:57 AM Thread Starter
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Thanks jaybird & rojo,

a vacuum tank is also a great idea and cheap too. I am also looking at a vacuum pump from GM part # 22034995. This was used on 82 chevy cavalier with 1.8 liter and also 81-86 pontiac j-1000, i hear they are going for around $20.00 in the junk yards. people are using these on electric cars.

Your input and thoughts are great.

Thanks,

Peter
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post #7 of 15 (permalink) Old Jan 22nd, 01, 11:41 AM
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i had the same problem at first, then i hooked the vacuum to the rear of the carb. base, mine works fine. also do you have the brake rod in the correct hole?

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post #8 of 15 (permalink) Old Jan 22nd, 01, 03:58 PM Thread Starter
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Hi Doug G

This i have to try,

and you may have solved my other problem, which is... I have my pcv valve going from the valve cover to the back of the carb, wouldnt this create a major vacuum leak???

brake rod is in the lower hole in brake pedal.

Thanks I will let you know what happens.
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post #9 of 15 (permalink) Old Jan 23rd, 01, 09:03 AM Thread Starter
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Hi guys i need your help again, i sprayed starting fluid around the the base of the carb and i stalled the engine...major vacuum leak!!!. so im in for a new intake and carb.

My question is, what do you guys recommend? I am running a 1970 lt1 350 with 11:1 compression.

Thanks again for your help and your input is greatly appreciated.
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post #10 of 15 (permalink) Old Jan 23rd, 01, 09:51 AM
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peter, try thiker gasket's first! some time's a thin one will not seal cause of the iregularity's between the carb and the intake.also take a straght edge to the carb base and the intake and check them out before you condem them! good luck.
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post #11 of 15 (permalink) Old Jan 23rd, 01, 11:02 AM Thread Starter
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hi ilbl8

I did the straight edge thing, and there ok. i rebuilt the carb, changed the base gasket a few times. what i see is a poor design on the intake manifold, the sides to the plenum are too thin, not a good mating surface. this has been an on goin problem for years, could never get it to idle right,allways running to rich. I do about 5 gallons to the mile(not a good thing).

Time to fix it right, so now im looking for a matched set(carb & intake).

Whats you opinion on the performer rpm air gap intake from edelbrock???

Thanks again and keep thhe input comming

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post #12 of 15 (permalink) Old Jan 23rd, 01, 08:49 PM
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go with the regular performer or torker, the air gap IMHO is a marketing thing, you see if you are a WOT racer it is a great idea but on a daily driver part time racer it is a wast of buck's. a daily driver need's the heat to perform like a daily driver. also i have some racer friend's that just smile and say..why? on a street car in the winter it would suck!LOL go with a regular torker or a performer. use the money you save and get a better carb... also if you go with a performer, cost's less then a torker, use a 4 hole 1" spacer to give you more bottom end or if you want top end use a 1" open spacer, hell a performer with a 1" open spacer is the torker manifold, well the torker has a 3/4"open plenum on average. i realy like the demon carb's haven't got one yet, but i have friend's that say the best thing since sliced bread. i trust them too as they race and build race car's for a liveing, and that is what they put on there street cars. the 625cmf road demon is a great carb for a 350, and at around $300.00 a great buy,and it come's with an electrick choke, the race demon with an electric choke is the beter carb to go with but they are around $450.00 so i guess go from there. oh and if you want a Q-jet the edelbrock 1904 is the one to get at around $420.00 and it is new not rebuilt, and has an electric choke.

[This message has been edited by ilbl8 (edited 01-23-2001).]

[This message has been edited by ilbl8 (edited 01-23-2001).]

[This message has been edited by ilbl8 (edited 01-23-2001).]
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post #13 of 15 (permalink) Old Jan 24th, 01, 12:42 PM Thread Starter
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I tried the thicker gasket today, but it still leaks. so i just ordered the performer intake and im going to use my carb for now and will see how she runs, may have to go with smaller carb.

Thanks for the help and ideas, will let ya know what happens.
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post #14 of 15 (permalink) Old Jan 24th, 01, 04:57 PM
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The plot thickens... If you have a vacuum leak then the problem with your power brakes may be related. Hold off on that pump or reservoir until you get your leak solved.

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Robert

'69 getting better every day... (every pay day)
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post #15 of 15 (permalink) Old Jan 24th, 01, 05:47 PM Thread Starter
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rojo

These are my thoughts too, all i can say is its a big leak. im not sure if its the intake or carb, i put a straight edge on both and they both look good.

We gonna take it one step at a time

With the help from you guys on this site, we will get to the bottom of the problem, this site is great, keep it going.

Thanks again
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