The Ford Barn - View Single Post

BUBBAS IGNITION · 11-08-2019, 03:09 PM

Been building these ignitions for many, many years and have had very very few issues with spark knock !!!
At approx 9-1 compression ratios and todays fuel ( actually very good) its just pretty damn hard to make a flathead spark knock.
However i have had a few (4-5) customers wanting me to slow the advance rates don and limit the advance on a flathead ignition rebuild.

Heres what one customer said today??

Jim i am sending the rebuilt crab that I got recently from you along w/ my older Mallory that you also did a long time ago. See if you can tell the difference in the Mallory vs/ the crab, and if possible, set the crab like the Mallory. I left the vacuum brake almost all the way down, it would knock under partial throttle, especially in 2nd gear. High RPM at full throttle, no knock, but low power. Like I said, the Mallory ran very well after you set it up. Let me know what I will owe you and I’ll get a check to you as soon as possible. Thanks again.

Open for discussion ??? I will add the actual numbers as i have the time to put on machine.....

Kurt

11-08-2019, 03:09 PM	#1
BUBBAS IGNITION Senior Member Join Date: May 2010 Location: SPEEDWAY INDIANA Posts: 4,148	Flathead "spark knock" ??????? Been building these ignitions for many, many years and have had very very few issues with spark knock !!! At approx 9-1 compression ratios and todays fuel ( actually very good) its just pretty damn hard to make a flathead spark knock. However i have had a few (4-5) customers wanting me to slow the advance rates don and limit the advance on a flathead ignition rebuild. Heres what one customer said today?? Jim i am sending the rebuilt crab that I got recently from you along w/ my older Mallory that you also did a long time ago. See if you can tell the difference in the Mallory vs/ the crab, and if possible, set the crab like the Mallory. I left the vacuum brake almost all the way down, it would knock under partial throttle, especially in 2nd gear. High RPM at full throttle, no knock, but low power. Like I said, the Mallory ran very well after you set it up. Let me know what I will owe you and I’ll get a check to you as soon as possible. Thanks again. Open for discussion ??? I will add the actual numbers as i have the time to put on machine..... Kurt __________________ If it Makes Spark, we do it !!!! www.bubbasignition.com [email protected]