bobl

Thought I'd share my winter project. Boat is a 28 Nordic Heat. Old engine was 900 HP Whipple engine. I sold that engine, which left me needing one. I wanted to build something a little different and I never really utilized all the HP I had. So, the decision was to build a 700+HP naturally aspirated engine. I ended up with a 10:1 598 with AFR 335 CNC heads, hydraulic roller cam and all the rest of the necessary hardware. The caveat was that I had an old 500 EFI intake sitting around that I wanted to play with. After all everyone knows they won' make any power. I also had a single plane 4bbl efi system not being used. Maybe I could play on the dyno some. Like eveything always does, it got a lot more involved. I decided to build my own plenum and got to talking with "Nordic Flame" about throttle bodies. I came up with a drawing and he machined 4-2 bbl throttle bodies for my intake. The dyno results speak for themselves. first one is with the 4 bbl tb, second was just changing to the new intake, no other changes except A/F tables.

bobl

Here are a couple of pics of the engine. The low end torque is truely amazing, and I don't have to spin a ton of RPM. I'm sure a huge intake and dominator style carb/tb would make more peak HP, but you can't beat the cool factor and torque.

bobl

By the way I owe a hugh thanks to Dave "Nordic Flame". Not everyone has a CNC machine at their disposal. Again Dave, THANKS!

Philm

Nice numbers. Good reliable power. Those carbs look pretty bad ass also!

I dont think my 598 is making that power with a single Dominator so you are doing something right.

Unlimited jd

iTrader: (5)

sweet set up looks nice and dyno sheets def look good !

Steve Zuckerman

Nice work Bob and Dave, as usual!
Looks very cool and different.
How many CFM are the throttle bodies?
That motor should live forever with the low RPM HP and N/A.
Best Regards,
Steve

JCPERF

That is nice setup good luck!

bobl

Never flowed the throttle bodies so I don't really know. We used the same bore size as the 1100 cfm 4 bbl throttle body, so around 2000 cfm would be my guess. I also ported the intake quite a bit. Another cool feature is that I installed 2 large idle adjusting screws in the back of the plenum(plus the IAC). I run the throttle blades all the way closed, that way there is no synchronization needed for idle. The TB's have progressive linkage and the secondaries don't open until past 1/2 throttle so the response is very soft and driveable. So far they work even better than I had hoped.

Bob Lloyd
Full Throttle Marine

Griswald

That's awesome Bob. I might drive out and take a look.

Clark

Young Performance

That is very slick Bob. I have been wanting to do something along those lines for some time. I just never seem to find the time. I'm sure you know what I mean. I had quite a different plan but that seemed to work very good. Placing the throttle bodies directly over the intake runners is obviously the way to go. Congrats. Very nice.
Eddie