Re: 451 B1 nitrous cam
[Re: 440Jim]
#2766136
04/19/20 10:18 PM
04/19/20 10:18 PM
|
Joined: Aug 2003
Posts: 4,676 On the parachute mount
n20mstr
master
|
master
Joined: Aug 2003
Posts: 4,676
On the parachute mount
|
best thing you can do is call Scott Brown, he can get you a good nitrous cam and he is familiar with this combination. Your heads will need chamber softening or your going to need some serious retard timing wise.
....BAD A$$ STREET CAR.....
|
|
|
Re: 451 B1 nitrous cam
[Re: n20mstr]
#2766146
04/19/20 10:44 PM
04/19/20 10:44 PM
|
Joined: Feb 2005
Posts: 20,174 PA.
pittsburghracer
"Little"John
|
"Little"John
Joined: Feb 2005
Posts: 20,174
PA.
|
Tom Hemphill has a lot of both B1 and nitrous experience. He is located in Pa.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
|
|
|
Re: 451 B1 nitrous cam
[Re: rick4106]
#2766171
04/20/20 01:23 AM
04/20/20 01:23 AM
|
Joined: Aug 2003
Posts: 43,173 Bend,OR USA
Cab_Burge
I Win
|
I Win
Joined: Aug 2003
Posts: 43,173
Bend,OR USA
|
This sounds like a stock block build, is it? If so which block and year casting is it? Did he (the engine builder) or you have the block sonic tested before starting? I sincerely hope so, especially if it is a 400 block. If it is a 440 block be very careful on how much power you make with it IHThs
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
|
|
|
Re: 451 B1 nitrous cam
[Re: rick4106]
#2766247
04/20/20 11:24 AM
04/20/20 11:24 AM
|
Joined: Aug 2003
Posts: 4,676 On the parachute mount
n20mstr
master
|
master
Joined: Aug 2003
Posts: 4,676
On the parachute mount
|
630 casting 400 block. Compression should end up around 11:1. No flow sheets yet on heads. Heads were down by Muscle Motors for a Top Dragster . Motor made a touch over 1000 with a 604. Softening chamber? OVER 1000 with a stock block? be very careful with nitrous on it. Sounds a little optimistic to me, but im sure its possible just don't see how its going to live long that's all. IF you putting a healthy dose of nitrous on it, Single digit timing is where id start, but you didn't give any nitrous PPH numbers so im only speculating here. Google Chamber Softening and im sure you will see whats involved. Basically it lays the chamber back and slows the flame front, allow more timing to be run or at least not be so timing sensitive for heads with small chambers like a B1
....BAD A$$ STREET CAR.....
|
|
|
Re: 451 B1 nitrous cam
[Re: 440Jim]
#2766249
04/20/20 11:26 AM
04/20/20 11:26 AM
|
Joined: Oct 2007
Posts: 4,206 New York
polyspheric
master
|
master
Joined: Oct 2007
Posts: 4,206
New York
|
Assuming this is race-only? The cam selection must include: how much nitrous?'
Chamber softening: convert all sharp edges into blended radius, dress down anything right at the spark plug, exhaust valve seat, and the dome's exhaust valve pocket. If you have a chamber and/or piston photo, I may be able to identify obvious troublesome areas.
Boffin Emeritus
|
|
|
Re: 451 B1 nitrous cam
[Re: polyspheric]
#2766285
04/20/20 12:26 PM
04/20/20 12:26 PM
|
Joined: Mar 2003
Posts: 9,099 Rogue River, OR
Jeremiah
master
|
master
Joined: Mar 2003
Posts: 9,099
Rogue River, OR
|
From what I have studied on the subject of chamber softening the general idea is to eliminate or relieve the quench pad and lay the chamber walls way back along with what was said above. It's something I want to try on the new combo here as well. Sure wish we could score an affordable cast iron low deck block! I have the same "630 casting" blues over here. Hopefully yours lived an easy life in a Cordoba or something because it's going to be hell from here on lol.
|
|
|
Re: 451 B1 nitrous cam
[Re: Cab_Burge]
#2766353
04/20/20 03:22 PM
04/20/20 03:22 PM
|
Joined: Oct 2007
Posts: 4,206 New York
polyspheric
master
|
master
Joined: Oct 2007
Posts: 4,206
New York
|
I agree, the smallest error with nitrous (too soon, too much, too lean, too hot, too advanced) is fatal at that power level.
Boffin Emeritus
|
|
|
|
|