How much compression do I need???
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From: Fort Myers, FL, USA
How much compression do I need???
Will OS CTR pistons give me enough compression to run this top end I am putting together? Also, if they won't is there not things I can do to up the compression like a thinner head gasket, flat faced valves (although I'd rather stick with oem), or milling the head (which I don't really want to do)
<U>B18C5 Head</U>
-Skunk2 Stg.3 cams
-Skunk2 springs
-Skunk2 retainers
-Skunk2 Pro Series Cam Gears
-AEBS manifold
-BBK 70mm TB
B18C5 bottom end has stock sleeves and will consist of Eagle Rods and whatever pistons I need to get. Also will be tuned with Hondata S200.
<U>B18C5 Head</U>
-Skunk2 Stg.3 cams
-Skunk2 springs
-Skunk2 retainers
-Skunk2 Pro Series Cam Gears
-AEBS manifold
-BBK 70mm TB
B18C5 bottom end has stock sleeves and will consist of Eagle Rods and whatever pistons I need to get. Also will be tuned with Hondata S200.
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Re: How much compression do I need??? (DonF)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DonF »</TD></TR><TR><TD CLASS="quote">Depends on what you are using for fuel.</TD></TR></TABLE>
He's using a combination of Nitromethane,Propylene Oxide,Cobalt Manganese,Toluene and A touch of Methanol Alcohol.
He's using a combination of Nitromethane,Propylene Oxide,Cobalt Manganese,Toluene and A touch of Methanol Alcohol.
Thread Starter
Honda-Tech Member
Joined: Aug 2005
Posts: 1,956
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From: Fort Myers, FL, USA
Re: How much compression do I need??? (DonF)
If 11.5 is all I'll need to run the setup I have will CTR pistons give me that? If not will a thinner head gasket be all I need?
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Thread Starter
Honda-Tech Member
Joined: Aug 2005
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From: Fort Myers, FL, USA
Re: How much compression do I need??? (kidd_drastic)
Too much compression? I was thinking I'd need a thinner head gasket to up the compression. What compression are they in an ITR motor?
Honda-Tech Member
Joined: Dec 2001
Posts: 3,643
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From: assville, MI, USA
Re: How much compression do I need??? (88 rex)
Do some searches on dynamic compression
Guessing aproximate numbers, or basing it off what fuel you will run is not going to net you the most power.
You need to find out how much the valve is open after bottom dead center with those cams, find out the dynamic compression and compare it to how much compression you had stock.
If you increase dynamic compression too much you can slow down the piston as it reaches TDC on the compression stroke which robs high end power.
Guessing aproximate numbers, or basing it off what fuel you will run is not going to net you the most power.
You need to find out how much the valve is open after bottom dead center with those cams, find out the dynamic compression and compare it to how much compression you had stock.
If you increase dynamic compression too much you can slow down the piston as it reaches TDC on the compression stroke which robs high end power.
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