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Cylinder Pressure 

 

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 Post subject: Cylinder Pressure
Posted: Mon Mar 04, 2013 3:45 pm 
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Hey all looking for tenths on the track and apparently the Cleveland has high cylinder pressure can this be altered by different lash settings on the springs?
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 Post subject: Re: Cylinder Pressure
Posted: Thu Mar 07, 2013 3:41 pm 
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for more compression you need to reduce combustion chamber size, thicken fuel going into camber

gassa

 

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 Post subject: Re: Cylinder Pressure
Posted: Thu Mar 07, 2013 5:04 pm 
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Static comp is at 13 to 1 tuned on AV gas
Cam @ 50 is 248 in & 256 ex
My question is if the exhaust side opens up earlier (thru valve settings) is their going to be any benefit on the cylinder pressure to run faster
Car runs 11.10 @ 122 mph chasing top qualify posi in super street class where do I find more power?
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 Post subject: Re: Cylinder Pressure
Posted: Thu Mar 07, 2013 5:35 pm 
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Theoretically, if your exhaust timing is earlier you would reduce cylinder pressure by increasing overlap unless, your rpm was greater. I would say test it out in both directions. What range can you set your valve lash at without hurting things? I assume you've already experimented with total cam timing adjustments?
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 Post subject: Re: Cylinder Pressure
Posted: Thu Mar 07, 2013 6:45 pm 
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Piston to valve was 200" thou so the 18" thou standard setting on the rockers can be tightened 2 to 4 thou without a worry.??? ( I presume )
Next time I'm down we'll tighten them up do a few passes see where we end up?
Cam timing settled on 26 deg
24' 11.4 @ 118
28' 11.4 @ 116
26' 11.3 @ 118
26' 11.1 @ 122 ( with carb leaned off a bit according to color on plugs ) don't think good idea to lean off any more
7k changes crossing line at 6700
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 Post subject: Re: Cylinder Pressure
Posted: Fri Mar 08, 2013 10:04 pm 
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Well it's worth a go. PV clearance shouldn't be a problem on the exhaust side, only intake which, you're not changing.
I was talking about cam timing. It seems you are listing ignition timing?
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 Post subject: Re: Cylinder Pressure
Posted: Fri Mar 08, 2013 10:12 pm 
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Cam timing isn't getting moved! To good a seal on the sump don't want to f**k it up
Set 1 deg adv each tooth worth 2 been told should have done on retard side but too late.
Maybe next time.
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 Post subject: Re: Cylinder Pressure
Posted: Sat Mar 09, 2013 8:10 pm 
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You didn't say what the LSA is or what valve lift you have ???
Where is the ign timing set at, idle and all in ???

 

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 Post subject: Re: Cylinder Pressure
Posted: Sun Mar 10, 2013 6:32 am 
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LSA???
Idle or valve lift has no relevance to the question.
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 Post subject: Re: Cylinder Pressure
Posted: Sun Mar 10, 2013 3:30 pm 
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Lobe Separation Angle. Maybe let us know your cam specs?
Ignition timing does make a difference as you've noted already. Changing your lash does, in fact, effect lift.
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