question about compression
3rd Gear Member
Joined: Sep 2006
Posts: 760
From:
RE: question about compression
nope. the opposite. Vacuum in the intake occurs because the engine will suck in all the air it possibly can if you let it. the throttle plate is what doesn't let it. So the more your throttle is closed, the more vacuum you have becuase the engine is trying to suck in air and it can't - so you get a really low pressure area after the throttle. The more open it is, the more the pressures are equal. The engine sucks in a ton of air so you may think that the velocity of the air into the engine's throttle body is like a vacuum of some sort, but in reality it is just moving air. (carburators work on this priciple of moving air and use a venturi to create a low presure area) but thats irrelevent. 20in/hg vacuum at idle and 0in/hg at wot.
Thread Starter
Joined: Sep 2006
Posts: 42
From:
RE: question about compression
well i just order a new fuel filter.... maybe it is low on flow because it spikes at first but then drops,but you would think that when i pull the vac line it would drop too, when the engine is rev-ed
Thread Starter
Joined: Sep 2006
Posts: 42
From:
RE: question about compression
can I check to see what the compression ratio is by using a compression gauge ? like how psi = 9.5:1 or 10:1 etc
also I am starting to have another problem. you may know by some of my past post that I was chasing a timing problem were at first the EEC was not controlling my timing and then it started to work so I reset my base timing , today 2 time while driving my car after shutting it off then getting back to goto store, it would do the missing thing again and if I put my foot into it would stop at about 3k RPM then drive normal then when I would shift it would do it again almost like a light switch when the power kick back in. some how I think the eec control is dropping in and out
I know by tracing the wire (at least I pretty sure) that the wire is good.
so its ether the EEC or the distributor ? and I had that rebuilt too but I think they just did bushing's , so is the electronic part on the
also I am starting to have another problem. you may know by some of my past post that I was chasing a timing problem were at first the EEC was not controlling my timing and then it started to work so I reset my base timing , today 2 time while driving my car after shutting it off then getting back to goto store, it would do the missing thing again and if I put my foot into it would stop at about 3k RPM then drive normal then when I would shift it would do it again almost like a light switch when the power kick back in. some how I think the eec control is dropping in and out
I know by tracing the wire (at least I pretty sure) that the wire is good.
so its ether the EEC or the distributor ? and I had that rebuilt too but I think they just did bushing's , so is the electronic part on the
5th Gear Member
Joined: Feb 2006
Posts: 3,768
From:
RE: question about compression
ORIGINAL: chadjones99
can I check to see what the compression ratio is by using a compression gauge ? like how psi = 9.5:1 or 10:1 etc
also I am starting to have another problem. you may know by some of my past post that I was chasing a timing problem were at first the EEC was not controlling my timing and then it started to work so I reset my base timing , today 2 time while driving my car after shutting it off then getting back to goto store, it would do the missing thing again and if I put my foot into it would stop at about 3k RPM then drive normal then when I would shift it would do it again almost like a light switch when the power kick back in. some how I think the eec control is dropping in and out
I know by tracing the wire (at least I pretty sure) that the wire is good.
so its ether the EEC or the distributor ? and I had that rebuilt too but I think they just did bushing's , so is the electronic part on the
can I check to see what the compression ratio is by using a compression gauge ? like how psi = 9.5:1 or 10:1 etc
also I am starting to have another problem. you may know by some of my past post that I was chasing a timing problem were at first the EEC was not controlling my timing and then it started to work so I reset my base timing , today 2 time while driving my car after shutting it off then getting back to goto store, it would do the missing thing again and if I put my foot into it would stop at about 3k RPM then drive normal then when I would shift it would do it again almost like a light switch when the power kick back in. some how I think the eec control is dropping in and out
I know by tracing the wire (at least I pretty sure) that the wire is good.
so its ether the EEC or the distributor ? and I had that rebuilt too but I think they just did bushing's , so is the electronic part on the
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