Q-500 Racing Discuss AMA 428, AMA 424, and any other variants of Quickie 500 racing

jett ls Q 500

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Old 09-18-2008, 06:31 PM
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angelgarcia
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Default jett ls Q 500

I HAVE Q500 LS JETT

IS IT CORRECT PUT Cylinder Shim FOR MORE PERFORMANCE

HOW I NEED PUT

WHAT IS YOUR RECOMENDATION
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Old 09-18-2008, 07:54 PM
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daven
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Default RE: jett ls Q 500

Call Dub and ask him.
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Old 09-18-2008, 08:25 PM
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Default RE: jett ls Q 500

What engine do you have?
This is a good time to call Dubb as he has no electric. I am not sure he has phone service but you can try. Do you have a BSE or Cast case? What vintage?Where is your head and liner.and what prop are you using? Your question has many answers.
Tom
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Old 09-18-2008, 11:24 PM
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Default RE: jett ls Q 500

Email Dub, things are getting back to normal here in Houston.
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Old 09-19-2008, 01:27 AM
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Default RE: jett ls Q 500

adding a shime or shimes to the case liner will increase port durations which does equal more rpm,s but torque will suffer also you must remember if you raise the liner your also raising the distance between the cylinder head dome and the piston crown which results in a lower compression ratio. you can try this cylinder raise but you must make sure you re set the squish [ head clearance ] to specified clearance settings. if you do this just check your case exhaust port to liner to make sure none of the liner top section is being blocked off by the case top. i have seen some moded race engines where the guys have raised the piston liner forgetting about the top of the case exhaust port which was partically blocking exhaust flows.
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Old 09-19-2008, 05:59 AM
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daven
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Default RE: jett ls Q 500

Just remember where you started and what you added or subtracted so you can always go back.

Do you have a way of measuring the sleeve and head height?

I've had good luck over the years leaving my heads a little higher than most, using a big prop, launching a little rich, and hope for the big unload Doesn't always work, but experiment and find out what works for you. Not sure your elevation, but my guess is that its higher than what most of us in the US deal with, so that may change things also.

Is there anyone in your area that races these things that could work with you and help show what works?

Ignore the .001 shims and start with .003 or even .005 adjustments and fine tune from there.
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Old 09-19-2008, 10:03 AM
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Default RE: jett ls Q 500

HI TOM

Q500 LS BSE .005 IN THE HEAD DONT IN THE CYLINDER

AND Q40 CAST CASE LS IN THE HEAD 2 .005 DONT HAVE IN THE CYLINDER
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