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NITROBANDIT1, My dry sump setup has non removable screens in the four pan exit connections. The four lines then go to four scavenge pump...
Scotttrod, Just curious but what is your piston to deck clearance? Joe
The following is Mike's initial procedure to set up a Barrel Valve: The true way to adjust the BV is to move the rod one flat at a time until...
First question I have is what are your idle temperatures with the BV valve set so low (25%)? Flames are probably caused by being to lean. I...
Get some plastic 10 gallon buckets from any hardware store. When you get to the track fill them with water and tie the bucket handles to your...
1/4miller, I would start looking for a screw blower because 40% overdrive is about the limit for a roots. What kind of boost are you getting...
Sorry guys I made a mistake. The 6.01 sec time is for 1000 ft not for the 1/8 mile. Yes I agree that would be confusing. Thanks, Joe
Mark, The hull is a Cheyenne, open boat, with a jet pump in it. Jets take a lot more power then V-drives do. Thanks, Joe
Thanks for the replies guys. My motor is a 548ci BBC with a roots 14-71 Littlefield in a drag boat. I rev limit the launch to the tree were...
Thanks for the replay rb0804. Are you saying I should use timers instead of relying on poppet pressures? Joe
I have a question on how do you set up several lean outs at different poppet pressures to arrive at a smooth AFR through out your RPM range? With...
Sorry my bad. Mike you are correct; I didn't provide enough information. I use a 70 tooth 8mm bottom pulley with the following top pullies and...
Thanks Trevor for your response. Joe
What is a good rule of thumb for a main jet change if you go up or down 2 teeth on an 8mm pulley change with a 14-71 roots blower on a 548 in3...
I have heard if they are to short you may get some warped valves? I don't know if this is a possibility or not; I have never experienced it. Joe
Thanks Guys for the info. I am going back to the .012 butter clearance in the hat and lean out the BV a little. I now need to look at my egt's...
I am trying to reduce my #3 and #8 high idle temps in my blown alky 548 BBC, PE drag boat motor. They are running around 700 deg. The motor has...
Roots versus Screw Everybody would love to have a screw blower, it looks cool. If your boost requirements are below 35 psi, why would anyone...
It seems to me that your idle and port checks are backwards; 20 psi idle and 17 psi port checks? Joe
I run a 70 pulley on the bottom with a 6 inch pump extension. I did have to remove about an 1/8" off the bottom of the pump extension. Get a RCD...
