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-   -   bench race air dyno my 489 (http://www.hotrodders.com/forum/bench-race-air-dyno-my-489-a-225321.html)

E.Furgal 10-23-2012 04:22 PM

bench race air dyno my 489
 
I'm going to put together (fingers crossed) this winter my bbc stoker

looking on picking a few peoples brains.. as I'm sure a lots changed since 2002 when I bought all the parts for this build...
it's a standard bore 4 bolt 454 that will be bored 30 over and to piston to wall clearance that srp list for the pistons..
the pistons are dome type yeilding a 10.2 to 1 static compression with 118cc heads... my heads are 121cc
srp doesn't list it but I'm going to guess that their compression listing is with the piston at zero deck...
the intake is a dart single plane.. picked single plane as I plane on efi down the road and it's not going to loose to much low end at 489 c.i.d.. and in efi.. it not be much of a factor..
the heads are darts pro 1's 345cc(not cnc ported) but will be port matched to intake gaskets the intake valve is 2.3" and the port flows398 @.800lift/28"
the exhaust port is raised .3" and exhaust valve is 1.88" and port flows 266cfm port is 129cc

the cam is a solid roller
http://i683.photobucket.com/albums/v...picsone-83.jpg

I have a 3 piece timing cover and the "hex-a-just" timing set to play with the timing to "dial in the power" at the track..

I haven't done anything but have the block magged..
in an engine like this what to I leave on the table not bringing the piston deck to zero?
untill efi I have 5 carbs to test on it.. 3310 750 vac 2nd, a 750 d/p and a 850 full race bearclaw, a 800 cfm q jet, and a standard q jet,
I have 2 dissy's a MSD billet and a g.m. points type converted with a crane convertion kit..
the bottom end is all good stuff as I plan on spray (2 stage)
lunati crank (4.25" stroke) and crowler rods (6.385")
full rollerized s/s rockers and arp everything... and march serp belt system...
windage control /etc/etc

what you say... bench race this...
was going in my 70 chevelle, but thats gone.. so it'll be in my 71 c-10 3800 lb's, th400 g/v and reargear up in the air, stall converter I have is 3300-3500...
anyone have a dyno sim.. to get a over inflated hp/ft lb numbers out of..

should I look at different cams?
truck will be a weekend toy/ summer toy with some track time..
spray will be after I get it to hook on its own.. if that ever happens..

Flame suit on :spank::boxing:
computer dynos :smash: go..

lmsport 10-23-2012 04:26 PM

625hp
550ftlb

E.Furgal 10-23-2012 04:28 PM

Quote:

Originally Posted by lmsport (Post 1602410)
625hp
550ftlb

my 454 at 8.75 to 1 made 525 ft lb and 500hp

35WINDOW 10-23-2012 04:34 PM

I'll say 675 hp
680# TQ

It should definitely put a dent in your Wallet (buying Tires! :thumbup:)

For comparison's sake, I have something kinda similar, in that the Duration is the same (.248/.254 @ .050 & 110 LSA), 10.2:1, however my Lift is .680, my Heads are AFR 315's and it's a 540-my Engine put out 775.5 hp & 740# TQ-

hcompton 10-23-2012 04:43 PM

Looks good i dont know much about big chevy but you seem to have all the bases covered. Cam doesnt look whimpy at least. I have never installed a cam too big just valves that were too small. LoL

Did you have the cam and crank lined bored. I hear it is a problem with big chevy. That is why aftermarket blocks are such good sellers.

The closer your going to come to 500 cubes or more the bigger the cam needs to be. Just as a rule but nothing to help on big chevys.

This is the standard for engine math and performance tuning. If you really want to calculate it all out.

lmsport 10-23-2012 04:59 PM

Quote:

Originally Posted by E.Furgal (Post 1602411)
my 454 at 8.75 to 1 made 525 ft lb and 500hp

I'm assuming a 750 carb as I dont know what a 850 bearclaw is.
Head probably only flows about 340 at 0.600in lift.
Cam is too small for a really big hp number but will run well on the street. With a bigger cam, and more compression, you could get 750hp.

E.Furgal 10-23-2012 05:06 PM

Quote:

Originally Posted by lmsport (Post 1602423)
I'm assuming a 750 carb as I dont know what a 850 bearclaw is.
.

ever hear of a guy called barry grant

or his later line of carb demons

hcompton 10-23-2012 05:28 PM

Is the race carb street able. They usally arent. I would go big. 750 dp is a great carb in your hp range but if your going for big power might as well get it out of the way early since you will have to put in tuning time on any carb.

The edelbrock 800 carb i had on my poncho was always too small. Had a holley projection 1000 cfm and it was terrible junk but wot worked. So as long as it was floored it made power. But it was never an issue of too much flow making the engine hit soft down low even with the big throttle body. It was nasty down low. 245 tires were not even noticed by the engine. If it coughed which the projection did all the time it would blow the tires away. Like the car sneezed. Boug-roar-screech

If you had a 1050 dom i would say to run that.

lmsport 10-23-2012 05:30 PM

Quote:

Originally Posted by E.Furgal (Post 1602427)
ever hear of a guy called barry grant

or his later line of carb demons

Ooh yeah, that guy.
The last sooper-duper BG carb I dynoed would not maintain a consistent A/F ratio after sending it back to be rubbed on a few times.
I use Willys or Braswell cuz I dont have time to straighten out some shiny carb from Summit.
I have built and dynoed almost the same engine you want to build, except the cam I used was even smaller for use in a daily driven car, the disp was 496, and the intake was a dual plane. That engine made 575hp on pump 93.

E.Furgal 10-23-2012 05:46 PM

Quote:

Originally Posted by lmsport (Post 1602441)
Ooh yeah, that guy.
The last sooper-duper BG carb I dynoed would not maintain a consistent A/F ratio after sending it back to be rubbed on a few times.
I use Willys or Braswell cuz I dont have time to straighten out some shiny carb from Summit.
I have built and dynoed almost the same engine you want to build, except the cam I used was even smaller for use in a daily driven car, the disp was 496, and the intake was a dual plane. That engine made 575hp on pump 93.

oh, so you're use'n 3000.oo carbs.. how much for that bridge again?
the bearclaw and demons pre 2009 are fine.. like everyone else he started cutting corners to stay in biz.. it didn't work..
as far as "that guy"
he IS the reason holleys carbs are 100x better than the garbage they sent out the door before he came along.. it forced holley to make better parts..

lmsport 10-23-2012 06:01 PM

Quote:

Originally Posted by E.Furgal (Post 1602453)
oh, so you're use'n 3000.oo carbs.. how much for that bridge again?
the bearclaw and demons pre 2009 are fine.. like everyone else he started cutting corners to stay in biz.. it didn't work..
as far as "that guy"
he IS the reason holleys carbs are 100x better than the garbage they sent out the door before he came along.. it forced holley to make better parts..

On a real racing engine...yes, I have spent over $3k for a single carb. I have spent $4k on a gauge legal two barrel for a LMSC engine just to get 10hp more than a $2k carb.

I gave away the 850 BG I mentioned and I would not take another one if they were free. Good luck with your project.

E.Furgal 10-23-2012 08:34 PM

Quote:

Originally Posted by lmsport (Post 1602458)
On a real racing engine...yes, I have spent over $3k for a single carb. I have spent $4k on a gauge legal two barrel for a LMSC engine just to get 10hp more than a $2k carb.

I gave away the 850 BG I mentioned and I would not take another one if they were free. Good luck with your project.

love the way you compair a 2-3-4 thousand dollar piece to a 350.oo-550.oo one.. comical at best

want to compair a 20 dollar cast piston to a 190.oo one next..

327NUT 10-23-2012 08:43 PM

What are "crowler rods":mwink:

E.Furgal 10-23-2012 08:56 PM

Quote:

Originally Posted by 327NUT (Post 1602514)
What are "crowler rods":mwink:

a typo..:spank:

vinniekq2 10-23-2012 09:06 PM

Im going to guess 700 hp plus or minus depending on final choice of parts. The 106 icl is curious for that large of engine.Use an 850 X as a minimum size.The flow numbers are important for a better guess.


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