Measuring Compression Ratio
#11
Yes,
http://store.katechengines.com/whist...ster-p174.aspx
You'll have to find a local shop that has one.
Jeff
http://store.katechengines.com/whist...ster-p174.aspx
You'll have to find a local shop that has one.
Jeff
That is exactly what I was thinking of, But definitely a lot cheaper to just disassemble motor etc lol. Figured in today's day and age they had to have some technology for measuring the ratio. But like you said I'm sure some high end machine shops have them.
#12
Registered
There are many shops that build spec engines. This is what the sanctioning body uses to check compression.
The engine builder will use it to make sure it passes before it goes to the customer.
If you pay 25,000 for an engine and inspection time comes around after the race, it better be right otherwise the engine builder will look pretty stupid.
Jeff
The engine builder will use it to make sure it passes before it goes to the customer.
If you pay 25,000 for an engine and inspection time comes around after the race, it better be right otherwise the engine builder will look pretty stupid.
Jeff
#14
Registered
#16
I'm curious how it works. Okay so you can calibrate it with a provided jug of known volume, but what does this have to do with compression ratio? So an engine exhausts a certain amount of air on the exhaust stroke, ok well if there is no valve overlap and none goes out the intake, it all goes out the exhaust and the volume can be measured, so that times the number of cylinders is the engine displacement. So how does it figure compression ratio? I'm not questioning that it works, just how it works?
#17
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iTrader: (1)
Look for big names in area that build heavily restricted 2bbl engines. If none look for Crate Engine / Spec engine builders. Like the Chevy 604 and 602's.
Back in my day (few eons ago) just track inspectors had them.
Back in my day (few eons ago) just track inspectors had them.
#18
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iTrader: (1)
I'm curious how it works. Okay so you can calibrate it with a provided jug of known volume, but what does this have to do with compression ratio? So an engine exhausts a certain amount of air on the exhaust stroke, ok well if there is no valve overlap and none goes out the intake, it all goes out the exhaust and the volume can be measured, so that times the number of cylinders is the engine displacement. So how does it figure compression ratio? I'm not questioning that it works, just how it works?
Using the WHISTLER is easy, just remove a spark plug and screw the WHISTLER adapter in its place. Enter the number of cylinders, CID, and temperature of the engine into the WHISTLER. Then, bring the engine to TDC and the unit will display the compression ratio to the nearest tenth of a point.
All you need is a low volume air source and a 120V AC supply
All you need is a low volume air source and a 120V AC supply
#20
Registered
iTrader: (3)
I'm curious how it works. Okay so you can calibrate it with a provided jug of known volume, but what does this have to do with compression ratio? So an engine exhausts a certain amount of air on the exhaust stroke, ok well if there is no valve overlap and none goes out the intake, it all goes out the exhaust and the volume can be measured, so that times the number of cylinders is the engine displacement. So how does it figure compression ratio? I'm not questioning that it works, just how it works?