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360 on the dyno |
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Greyhounds_AMX
AMC Addicted Joined: Nov/14/2009 Location: Kansas City Status: Offline Points: 1268 |
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Thanks for digging that out. Do you know why they picked that particular exhaust lobe? I didn't see that one on their 904 lobe list.
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1968 AMX 390 w/T5
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jcisworthy
AMC Addicted Joined: Jul/23/2009 Location: North Carolina Status: Offline Points: 2805 |
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I picked the lobes. They are both on the .904 lobe list
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Specializing in dyno services, engine building, and cylinder head porting
rbjracing.com Phone Number 518-915-3203 |
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AMX1972
AMC Apprentice Joined: Oct/11/2008 Location: Massena Iowa Status: Offline Points: 161 |
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It would be interesting to see what effect removing the wall in the plenum on the air gap would do to your numbers and side to side air fuel...
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1972 Javelin AMX T/A Red 360/4 speed
1968 AMX "The Pied Piper" "Cam Only" 390/727 1/8th mile bracket racer on E-85. 10.92@121.9 mph. |
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jcisworthy
AMC Addicted Joined: Jul/23/2009 Location: North Carolina Status: Offline Points: 2805 |
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I milled a cut out about 1/4" down for about 75% of the length of the wall in this intake
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Specializing in dyno services, engine building, and cylinder head porting
rbjracing.com Phone Number 518-915-3203 |
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AMX1972
AMC Apprentice Joined: Oct/11/2008 Location: Massena Iowa Status: Offline Points: 161 |
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Nice work! I enjoy seeing 360 successes
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1972 Javelin AMX T/A Red 360/4 speed
1968 AMX "The Pied Piper" "Cam Only" 390/727 1/8th mile bracket racer on E-85. 10.92@121.9 mph. |
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BassBoat
AMC Addicted Joined: Aug/29/2008 Status: Offline Points: 1719 |
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lots of info in this post. Thanks for sharing! I'm curious about why you chose a smaller than stock exhaust valve and how you got that to work. Did you install seats? My only experience with 1.6 valves was bad. Three or 4 reseded to the point they beat up the seats and I had to go to a 1.76 valve when the heads were freshened up. There were other issues on that engine and with that builder, so might not necessarily be the whole story. But it would scare me to do it.
BB
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jcisworthy
AMC Addicted Joined: Jul/23/2009 Location: North Carolina Status: Offline Points: 2805 |
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I use 1.6 valves in factory heads using 1.625 or smaller. The larger 1.68 valve heads I use 1.65 valves and do not have issues with them.
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Specializing in dyno services, engine building, and cylinder head porting
rbjracing.com Phone Number 518-915-3203 |
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5799 |
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Are you re-cutting the valve seat angle as part of the process or still using factory 30 deg setup?
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I've finally given up drinking for good...........now I only drink for evil.
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jcisworthy
AMC Addicted Joined: Jul/23/2009 Location: North Carolina Status: Offline Points: 2805 |
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I re cut using 45* seats with all my iron heads. I also use 11/32 or 8mm stem valves in all my heads also.
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Specializing in dyno services, engine building, and cylinder head porting
rbjracing.com Phone Number 518-915-3203 |
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5799 |
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Cool, that’s pretty much as expected.
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I've finally given up drinking for good...........now I only drink for evil.
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