Question For Engine Guys

Bill84 · 4/7/18, 7:11 AM

I think you will find also that standing the valve up allows for a smaller combustion chamber, therefore higher compression with less piston dome.

Bill

wallbanger II · 4/7/18, 9:32 AM

how do I know what dash 12 heads specs.one has .# on the end ? please

Eric Smith · 4/7/18, 2:44 PM

I have a set of Brodix -12 heads that were ported by Weldtech. I wanted to know about the heads. I got ahold of both companies and gave them the numbers stamped into the heads and they told me everything I could ever ask about and more. They were great.

dstensland · 4/7/18, 2:53 PM

If you go to Brodix website, you can enter serial number for the head and the will tell you casting date and the head type.
http://brodix.com/serial-number-identification

revjimk · 4/7/18, 3:06 PM

Quote:

Originally Posted by motorhead748

Technically the stem. The lesser the angle, the straighter the path to the cylinder.

Thanks. I actually found a perfect diagram of that on the Net, tried to post it, but can't for some reason... "copyright" was mentioned
Since we're on "Dummies Guide to Sprint Car Engines", I have another question that I asked a few years ago & didn't really get the answers: Down nozzles: Do they carry pure fuel, or fuel air mix? If its pure fuel, doesn't that alter fuel/air mix? Do they compensate by running the injectors leaner?

Tony74 · 4/7/18, 3:27 PM

Nozzles lines up or down are just fuel, the nozzles has an air gap to prevent sfioning, that is were fuel atomization occurs.

motorhead748 · 4/7/18, 3:49 PM

Quote:

Originally Posted by revjimk

Thanks. I actually found a perfect diagram of that on the Net, tried to post it, but can't for some reason... "copyright" was mentioned
Since we're on "Dummies Guide to Sprint Car Engines", I have another question that I asked a few years ago & didn't really get the answers: Down nozzles: Do they carry pure fuel, or fuel air mix? If its pure fuel, doesn't that alter fuel/air mix? Do they compensate by running the injectors leaner?

A engine can have up or down nozzles or both. Until the fuel reaches the nozzle it's 100% fuel. The nozzles are vented which allows the fuel to draw in air.

revjimk · 4/7/18, 3:55 PM

Thanks, Motorhead!

revjimk · 4/7/18, 3:59 PM

Quote:

Originally Posted by Tony74

Nozzles lines up or down are just fuel, the nozzles has an air gap to prevent sfioning, that is were fuel atomization occurs.

Thanks Tony.... I won't even make fun of your spelling

"syphoning"

revjimk · 4/7/18, 4:00 PM

Some guys can spell, others can build engines. Wish I could do both!

4/7/18, 7:11 AM	#11 Re: Question For Engine Guys
Bill84 Member Race Count This Year: 17 Race Count Last Year: 13 Join Date: Nov 2008 Posts: 172	I think you will find also that standing the valve up allows for a smaller combustion chamber, therefore higher compression with less piston dome. Bill

4/7/18, 9:32 AM	#12 Re: Question For Engine Guys
wallbanger II Senior Member Join Date: Aug 2007 Posts: 1,819	how do I know what dash 12 heads specs.one has .# on the end ? please

4/7/18, 2:44 PM	#13 Re: Question For Engine Guys
Eric Smith Member Join Date: Nov 2011 Posts: 249	I have a set of Brodix -12 heads that were ported by Weldtech. I wanted to know about the heads. I got ahold of both companies and gave them the numbers stamped into the heads and they told me everything I could ever ask about and more. They were great.

4/7/18, 2:53 PM	#14
dstensland Member Join Date: Aug 2007 Posts: 142	If you go to Brodix website, you can enter serial number for the head and the will tell you casting date and the head type. http://brodix.com/serial-number-identification

4/7/18, 3:27 PM	#16
Tony74 Senior Member Join Date: Jul 2007 Posts: 945	Nozzles lines up or down are just fuel, the nozzles has an air gap to prevent sfioning, that is were fuel atomization occurs.

4/7/18, 3:55 PM	#18 Re: Question For Engine Guys
revjimk Senior Member Join Date: Aug 2014 Posts: 1,893	Thanks, Motorhead!