Good luck !

Got a wideband on those things ?

20 percent overdriven

Id take a close look over the igntiion system, plugs, etc. I had a bad plug on the dyno. Still made 760 on 7 cylinders. Replaced plug, 818hp. Had the marine exhaust on so no egts to tell me

Unhooking it now. Made 850 at 7# boost. Will post sheet when I get home

Thats more like it. I would have thought around 900 with 9psi

what did you do to get the power up?good numbers,excellent job on the build

Final pull. Spark arrestor on, full marine trim, lightning headers. I will tweek the AFR's if necessary once I get it in the boat.[ATTACH=CONFIG]566370[/ATTACH]

Thanks, timing, jetting and valve lash. Found 70HP today It actually made a little better pull today with 35 deg timing and spark arrestor off, but not really real world.

As a side note. Made back to back pulls with and without water running through the chiller. I forgot to turn it on actually. Made over 30HP difference.
I have a Baker Engineering 7.5# mechanical pump on this engine. It is supposed to support 1200HP, but it won't keep up. 3 pounds of fuel pressure at 6000rpm with a -8 line in and out. Might have to ditch it for something else. I love the simplicity of it but ? Ideas?

Nice build. What lifters you running ?

Always good when a build exceeds your expectations! :)

can you change the spring to up the pressure to 10lbs?

I had the same issue, running out of fuel pressure at 6000.
Changed over to the Baker higher pressure, plumbed in regulator and a tank return.
No more issues


Before :

http://33outlaw.zenfolio.com/img/s/v-2/p6385609-4.jpg



After:

http://33outlaw.zenfolio.com/img/s6/...82693925-4.jpg

Dammit! You`re gonna make me buy chillers
:mad:

No Idea on the fuel pump spring, I will call Baker on Monday and ask

I used the Comp Cams short travel race series lifters. They are quiet and they didn't collapse. That is about all I can say about them so far.

very good lifter,,thats what I put in a few motors,and they all see some rpm,,for long runs at a time.
I know they can last 90hrs at 275lbs on the seat.out of 32 lifters,only 1 failed catastrophically.

Those new comp short travels sparked my interest. The pricing doesnt seem to bad on them either. Seems like comp cams has stepped up their game lately

you can't go wrong w/ them and for the price.no brainer.
A member on this board went w/ morels,,noise right after fire up,idled them a few times,let them sit,,a day or 2,,fire back up,even noisier and running like schit. pulled engines down,4 out of 32 lifters collapsed.

I probably should have given those short travel lifters a try with new builds but stayed with solid rollers and cams. Going to stick with them for now anyway but hopefully these new comps will prove themselves to be trouble free. My luck short/long travel they'd probably fail given my history with hydraulics.

Any reason why std travel hyd lifters might be a thing of the past? Just thinking outload.

MT looks like you have electric fuel pressure gauge. I like that. You ever able to confirm electric is spot on or very close anyway to mechanical while at WOT? I see this being vital on SC builds considering the demand out of the fuel pumps etc.

Really no different than any other mechanical vs electronic gauges. In a sense the one on the fuel log that many utilize is ok to have if your concerned with pressure at idle... ya know.

Snapmorgan congrats on the build. When time permits call norm at competition fuel system (CFS) here in Michigan. You probably saw the low comp 548 thread smitty started and used that 850 holley carb he got from norm that flows like 1,100 cfm if I'm not mistaken. That's where mine are going next winter. But for now I'm going take it easy on my drives and call it good.

Did you get a flow sheet with your current carbs. I think you'd see some pretty good gains going to 1,000 cfm x2 but like you said all is good for now and you exceeded your goals for now.

That is what I was thinking too on bigger carbs, BUT, these carbs flow 830CFM and we measured the airflow on the dyno and we were only drawing 680CFM through each carb sitting on top of a 1" open spacer.. I now believe that they are plenty big enough. If I were going to buy some new carbs, I would buy some Willy's. They are local to me and build some of the finest carbs in the world. When I was dirt track racing, we used Willy's dyno for our engines in exchange for freshening up their Nascar test mules that they thrashed on every day. I saw several times on max effort small blocks, 730hp, 430ci, when we bolted on one of their carbs, it would pick up 30hp over anything else. Not too shabby for just replacing a carb

I called Baker, They are sending me the 15# spring for the fuel pump. Said that it should support 1000HP no problem

Ordering my drive guardian today

Joe,, Your Drive Guardian is ordered as per your dyno specs.,will be here in a few days,,, I am Going to order another one soon,
Thanks

Dynoing engine #2 tomorrow, The one with the 8-71 Littlefield

[QUOTE=snapmorgan;4547923]Dynoing engine #2 tomorrow, The one with the 8

After seeing how the first one did, I think mine is in good hands!!!

Both engines exactly the same ? Besides the blower ?

Almost. The first one is 8.7-1 because the heads have been cut. The second one is 8.5-1. Other than that, they are identical. I have realized today that this blower is most likely a 10-71. It will probably make 1000hp, but I am going to pulley it down to around 850 as well. I can't have his boat faster than mine.

[QUOTE=BIGSLOW;4547957] I have your short block and heads done and all of the parts here to finish it. I can probably put it back in your boat next week if you are ready

[QUOTE=snapmorgan;4547988]What pulleys you starting with on the 8-1071 build? I'm looking for a starting point on my (now 548) TBS 8:71 builds with the promaxx heads currently at 340 cc. 8.7:1 comp.

Tks
John

I am starting with a 53 and 49 at 8% overdriven, but I have 5 total pulleys that I will be taking for lots of different combinations

joe,i have a tub full of 8mm pulley,s if you need to borrow for dyno day.

After checking chart again (been years) I would imagine I would be right in there close but just not certain with cam/head combo etc.

Mike if you send me a basket when I dyno I will make you a killer deal on my 049's. In fact if you wanna make a run up for a day and help out I will pass them onto you. Just might cost you a couple of pulleys.

interesting,i would be more than happy to come&check out the dyno session.i don,t want to sell any of the pulley,s but i can bring them and when the best combination is found i can tell you a good place to buy the ones you need. as far as the 049s i can find a use for them if the price is right.how far are you from chicago?

More power racing is about 40 minutes from grand haven. http://morepowerinc.com/ If it's to far I understand. I would bring heads with and give you deal worth driving up for (cheap) and have some fun at the same time. Builds are my 548's, tbs 871's, promaxx 317's valakoized, holley 850's. SR 900/1075 sc cam. Not doing any cam swaps at this point. Just tuning round one, AFR's, EGT's, BSFC, Timing, jetting. Not trying to squeeze every bit of HP but don't want any slouches either.

almost exact copy of the 548s i built for my cat but with dart 320 race series heads with no porting and had superchiller,s,right at 950 hp.when do you plan on running them,im up for a road trip.edit in,i had crane 651 cam,s.

I have 540s 8.25-1 comp. dart 345 heads and tbs 8-71s 850cfm quick fuels but no inter coolers. with 49-52 pulleys 6% underdriven I have 5.5 pounds of boost.

Dyno day went pretty well. First pull after break in made 920Hp with AFR's in the mid 13's. Kept removing boost and adding fuel and this is where we ended for the day. Idles great, no surge, purrs like a kitten down low, roars like a lion up top.[ATTACH=CONFIG]566617[/ATTACH]

looks good joe,might want to jet it up a little in the boat.

Awesome info man.

So, roughly two identical engines, except one having a 420 B&M , and other an 8-71 Littlefield. Both with 7lbs boost it appears?

Looking like the peak HP at 6000 was close, the B&M making a few more hp, but I noticed it looks like the B&M was making a fair amount peak more torque. Maybe do to the higher overdrive speed ..

easier to read this way