347 on dyno do not like timming advance...
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347 on dyno do not like timming advance...
I have my first time on Dyno yesterday, it runs ok but do not like more than 31 total timming advance
400hp-5962rpm(tranformed from rwhp /.75) at 31º and 390hp at 35º on 95 octane gas , litle lean .92 air/fuel lambda
406hp-5490rpm (tranformed from rwhp /.75) at 31º and 395hp at 35º on sugar cane Ethanol 100% (not e85) lean .93 lambda
Is this timming ok? Title lean air/fuel ratio could be the question?
It was very warm 96º F on gas test and 103º F on ethanol test.
I was expect 34 or 36º be better.
Thanks in advance.
347 sbf, 9.8 CR (very low for ethanol), afr 185, autolite 3923 plugs 0.39gap, mallory 6al/msd pro billet dist, comp xe 274 hidraulic, performer rpm airgap, 1 5/8 hedmam headers full exsaust summit chamber muflers. Power stearing pump, water pump and alternator w/out underdrive.
chamber muflers. Power stearing pump, water pump and alternator w/out underdrive.
400hp-5962rpm(tranformed from rwhp /.75) at 31º and 390hp at 35º on 95 octane gas , litle lean .92 air/fuel lambda
406hp-5490rpm (tranformed from rwhp /.75) at 31º and 395hp at 35º on sugar cane Ethanol 100% (not e85) lean .93 lambda
Is this timming ok? Title lean air/fuel ratio could be the question?
It was very warm 96º F on gas test and 103º F on ethanol test.
I was expect 34 or 36º be better.
Thanks in advance.
347 sbf, 9.8 CR (very low for ethanol), afr 185, autolite 3923 plugs 0.39gap, mallory 6al/msd pro billet dist, comp xe 274 hidraulic, performer rpm airgap, 1 5/8 hedmam headers full exsaust summit chamber muflers. Power stearing pump, water pump and alternator w/out underdrive.
chamber muflers. Power stearing pump, water pump and alternator w/out underdrive.
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Done a gas Ford 408 couple years back, much higher compression than yours though. Had Roush heads. Did not like more than 28* total timing. And ran better with 27*.
Bret
Bret
Last edited by PFC1 on Mon Sep 28, 2009 8:28 am, edited 1 time in total.
Pullin' for Christ
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How much power did it make?PFC1 wrote:Done a gas Ford (406 I believe) s couple years back, much higher compression than yours though. Had Roush heads. Did not like more than 28* total timing. And ran better with 27*.
Bret
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You're making some pretty good power through mufflers based on
the cubes, low compression and fuel.
There is likely some extra power hiding in the exhaust/intake tuning,
and mechanical settings (cam phase, lifter settings, etc.).
Don't be upset that your engine makes more power with less timing.
Look for ways to bump the power like altering the muffler placement/
secondary lengths, carb spacers/flow plates, and things of that nature.
the cubes, low compression and fuel.
There is likely some extra power hiding in the exhaust/intake tuning,
and mechanical settings (cam phase, lifter settings, etc.).
Don't be upset that your engine makes more power with less timing.
Look for ways to bump the power like altering the muffler placement/
secondary lengths, carb spacers/flow plates, and things of that nature.
Is this your intake air temp by chance?It was very warm 96º F on gas test and 103º F on ethanol test.
It was just shy of 600, circle track deal using the iron Roush heads... it really needed more head on it. But it did run very well in the car.xstfudonniex wrote:How much power did it make?PFC1 wrote:Done a gas Ford (406 I believe) s couple years back, much higher compression than yours though. Had Roush heads. Did not like more than 28* total timing. And ran better with 27*.
Bret
Bret
Pullin' for Christ
I've seen a lot of fords running the "N" heads, and it's normal for them to run timing in the 30-32 range.
Mike Jones
Jones Cam Designs
Denver, NC
jonescams@bellsouth.net
http://www.jonescams.com
Jones Cam Designs' HotPass Vendors Forum: viewforum.php?f=44
(704)489-2449
Jones Cam Designs
Denver, NC
jonescams@bellsouth.net
http://www.jonescams.com
Jones Cam Designs' HotPass Vendors Forum: viewforum.php?f=44
(704)489-2449
I just started using the N351 head. I started at 28* and am at 37*now. the reason i belive im so high is I have ressesed plug and using 110 fuel with 10.5:1.CamKing wrote:I've seen a lot of fords running the "N" heads, and it's normal for them to run timing in the 30-32 range.
Darrell
67 Mustang 3000# 310ci NA 10.17 130.5mph,1.36 60'
67 Mustang 3000# 310ci NA 10.17 130.5mph,1.36 60'
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Re: 347 on dyno do not like timming advance...
v8_super wrote:I have my first time on Dyno yesterday, it runs ok but do not like more than 31 total timming advance
400hp-5962rpm(tranformed from rwhp /.75) at 31º and 390hp at 35º on 95 octane gas , litle lean .92 air/fuel lambda
406hp-5490rpm (tranformed from rwhp /.75) at 31º and 395hp at 35º on sugar cane Ethanol 100% (not e85) lean .93 lambda
Is this timming ok? Title lean air/fuel ratio could be the question?
It was very warm 96º F on gas test and 103º F on ethanol test.
I was expect 34 or 36º be better.
Thanks in advance.
347 sbf, 9.8 CR (very low for ethanol), afr 185, autolite 3923 plugs 0.39gap, mallory 6al/msd pro billet dist, comp xe 274 hidraulic, performer rpm airgap, 1 5/8 hedmam headers full exsaust summit chamber muflers. Power stearing pump, water pump and alternator w/out underdrive.
chamber muflers. Power stearing pump, water pump and alternator w/out underdrive.
the SBF Chamber likes a lot less BTDC timing than same cid/CR Chevy engines
27btdc to 32btdc range is mostly what i've seen .