Working on a 74 JDX-8 tonight. KEC-440/22.
Tested compression at 175 lbs.
WHAT??
Did I do something wrong or did I do everything right?
Ultra high performance JDX-8
Ultra high performance JDX-8
Todd Schrupp
Milbank SD
Milbank SD
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JDXspec
- Posts: 896
- Joined: Thu Jul 21, 2005 12:00 am
- Real Name: Dustin
- Location: SW Minnesota
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Re: Ultra high performance JDX-8
Theres a reason they called for premium gas for the earlier deeres. sounds like its a really good engine.
Own 74 295/s, 75 340/S, 800, 76 440 Liquifire, 300, Liquidator (3), 78 440 Liquifire, 340 Liquifire CC, 80 Liquifire, 82 Trailfire LX, 83 Sprintfire 84 Sportfire
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harleysportster
- Posts: 2965
- Joined: Thu Jul 14, 2005 12:00 am
- Real Name: Pat Scott
- Location: Southeast Pa.
Re: Ultra high performance JDX-8
You may have 340 heads on it. My rebuilt 76 cyclone was only around 145 lbs. Are you sure you have a good gauge?
'76 440 cyclone
'76 440 liquifire
'78 440 Cyclone
'75 JDX8 (sold to a member here)
'78 Liquifire(CrossCountry Clone)
'80 Liquifire(sold)
'76 440 liquifire
'78 440 Cyclone
'75 JDX8 (sold to a member here)
'78 Liquifire(CrossCountry Clone)
'80 Liquifire(sold)
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400brian
- Posts: 5626
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- Real Name: James T. Kirk
- Location: South Central Wisconsin
Re: Ultra high performance JDX-8
If that number is correct, it must be a SOB to pull over! 
'09 Vintage Challenge Survivor, and I wasn't late for supper!
'10, '11, '12, '13,'14,'15,'16,'17, '18, 19, 20, 21, 22 Vintage Challenge Survivor !
72 400 restored, Father bought new in '71
73 X8 restored
'74 340 green machine
'74 X8 9 time VC finisher
'78 Spitfire in progress
2 '75 340S 1 running, one on deck
'78 LF 440 future CC clone
'73 Skiroule RTX 440, 500 mi.
Re: Ultra high performance JDX-8
That is the reason I posted this. I have never had a 22RV with that kind of compression.
Yep the guage is reliable. And yes Brian it is a pull but not as bad as a 775 Rotax.
I have not started it yet. No ES and no fan belt.
You know it could have smaller heads. Never really checked that close.
Sled has over 5000 miles on it but everything has been rebuilt.
Yep the guage is reliable. And yes Brian it is a pull but not as bad as a 775 Rotax.
I have not started it yet. No ES and no fan belt.
You know it could have smaller heads. Never really checked that close.
Sled has over 5000 miles on it but everything has been rebuilt.
Todd Schrupp
Milbank SD
Milbank SD