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Stroker 304 Project Build |
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amundaza
AMC Apprentice Joined: Oct/15/2008 Location: Rochester Hills Status: Offline Points: 166 |
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Hey guys, Just got a response back from Endyn on the Swirl Port heads and the A/F ratios they saw with the 2-valve cylinder heads. These are the guys that helped Bill Elliot's team, among others. My questions way below in Purple and their response in Green.
Greg :)
From: Staff@theoldone.com <staff@theoldone.com> We were running BSFC's lower than .34 with race engines some 24 years ago with EGT's in the 900° range (measured .5 x pipe diameter from the port flange). As long as you're not seeing detonation, or extreme temps on the exhaust side you can continue to run leaner and leaner. Of course, A/F ratio's will "freak out" those with conventional wisdom. As i recall the lowest A/F numbers we saw with 2-valve engines were in the 24-1 range at light throttle and light load conditions. 18-1 was common under load (with good atomization). Be aware that once you go far enough below stoic, the EGT's will begin heading downward. You might want to include something like an MSD Knock Alert to your dyno instrumentation, so you can "see" detonation that's not audible should it occur. Larry ----- Original Message ----- From: Greg Taylor Sent: Monday, March 16, 2009 9:11 AM Subject: Question on Swirl-Port and A/F ratios (was : AMC Stroker 304 back from the Dyno)
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Sincerely,
Greg Taylor |
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amundaza
AMC Apprentice Joined: Oct/15/2008 Location: Rochester Hills Status: Offline Points: 166 |
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Here are pics from Saturday's dyno run. |
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Sincerely,
Greg Taylor |
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amundaza
AMC Apprentice Joined: Oct/15/2008 Location: Rochester Hills Status: Offline Points: 166 |
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Sincerely,
Greg Taylor |
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amundaza
AMC Apprentice Joined: Oct/15/2008 Location: Rochester Hills Status: Offline Points: 166 |
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Baseline pulls with a points distributor 34* advance and a 625-cfm Carter AFB 4-bbl
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Sincerely,
Greg Taylor |
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amundaza
AMC Apprentice Joined: Oct/15/2008 Location: Rochester Hills Status: Offline Points: 166 |
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HEI distributor 34* advance with 625-cfm Carter AFB 4-bbl
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Sincerely,
Greg Taylor |
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amundaza
AMC Apprentice Joined: Oct/15/2008 Location: Rochester Hills Status: Offline Points: 166 |
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HEI distributor 32* advance with 625-cfm Carter AFB 4-bbl |
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Sincerely,
Greg Taylor |
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amundaza
AMC Apprentice Joined: Oct/15/2008 Location: Rochester Hills Status: Offline Points: 166 |
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HEI distributor 30* advance with 625-cfm Carter AFB 4-bbl |
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Sincerely,
Greg Taylor |
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amundaza
AMC Apprentice Joined: Oct/15/2008 Location: Rochester Hills Status: Offline Points: 166 |
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HEI distributor 30* advance with small 1.65" bore FISH CARB |
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Sincerely,
Greg Taylor |
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Buzzman72
AMC Addicted Joined: Sep/15/2009 Location: Southern IN Status: Offline Points: 2725 |
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So...would you call the project a success?
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Buzzman72...void where prohibited, your mileage may vary, objects in mirror may be closer than they appear, and alcohol may intensify any side effects.
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amundaza
AMC Apprentice Joined: Oct/15/2008 Location: Rochester Hills Status: Offline Points: 166 |
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I don't know yet, as I don't have the engine in the Jeep yet. I am just finishing up a 10x12 shed project, so that I can clear the "extra" stuff out of my garage and get back to finishing the Grand Wagoneer. I plan to get back on it next week, as all I have left to do is shingle the shed and move the stuff this weekend.
Stay tuned, it's been a long summer :)
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Sincerely,
Greg Taylor |
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