bottom end strength

birdmanmdp · 01-08-2009, 02:48 PM

i have a 92 sierra with a tbi 5.7 and i got a midrange cam, intake manifold, throttle body, and headers. do i need to worry about my bottom end if i start puttin more power in it

75K30 · 01-08-2009, 03:01 PM

You have not inccreased compression, and unless you plan on turning that engine past 6500 rpm, you bottom end is not affected.
You really are not putting any additional strain on the bottom end.

What other plans do you have? How much power are you making now?

birdmanmdp · 01-08-2009, 03:17 PM

im puttin 380 to the wheels , i might upgrade my ignition and get exhaust, but other than that im done for now.... any advice on how to get some traction....

batty1214 · 01-08-2009, 05:18 PM

What kind of tire you running?

leolkfrm · 01-08-2009, 06:51 PM

pt 1000#'s in the back for traction

kinda defeats the build up though

75K30 · 01-08-2009, 07:44 PM

What TB are you using to suport 380 HP to the tires? What heads are on this thing?
Conservative parasitic losses would mean that you have to be making in excess of 410 hp (conservative) at the crank to obtain a 380 RWHP figure.
You mantioned intake, cam, and some headers. Do you have some magic in there to arrive at this figure? How did you confirm this?

I only ask because of you are really making more than 1 hp per cubic inch, (not easy to do) then you have done some serious mods, and a stock cast crank will not support this for very long.

stumpuller454 · 01-08-2009, 07:50 PM

Quote:

Originally Posted by 75K30

What TB are you using to suport 380 HP to the tires? What heads are on this thing?
Conservative parasitic losses would mean that you have to be making in excess of 410 hp (conservative) at the crank to obtain a 380 RWHP figure.
You mantioned intake, cam, and some headers. Do you have some magic in there to arrive at this figure? How did you confirm this?

I only ask because of you are really making more than 1 hp per cubic inch, (not easy to do) then you have done some serious mods, and a stock cast crank will not support this for very long.

+2!!!!!! whats your secret?

mudseeker · 01-08-2009, 08:06 PM

he added up the numbers on the parts box.

just pokin' bud.

436'd skylark · 01-08-2009, 10:09 PM

[quote=birdmanmdp;87832]im puttin 380 to the wheels , iquote]

sorry, but no way. not with tbi unless your spraying a 150 shot at it. I agree with 75. Although, I wouldn't go past 5800-6k. There is no way the stock prom would even support 300 at the wheels, or the crank really.

But if you are making 380 at the wheels, the 700r sure ain't long for this world..

birdmanmdp · 01-09-2009, 04:49 AM

i got an edelbrock power package that my father inlaw is puttin on for me that claims 410 horse, so he figures its around 380 to the wheels.... everything else is stock except the wires and plugs..... stock bottom end, tranny, and rear end..... its supposed to be all put back together saturday so im really just goin on what he tells me right now

01-08-2009, 02:48 PM	#1
birdmanmdp Full Member Join Date: Jan 2009 Location: fayetteville, ga Posts: 16	bottom end strength i have a 92 sierra with a tbi 5.7 and i got a midrange cam, intake manifold, throttle body, and headers. do i need to worry about my bottom end if i start puttin more power in it

01-08-2009, 03:17 PM	#3
birdmanmdp Full Member Join Date: Jan 2009 Location: fayetteville, ga Posts: 16	im puttin 380 to the wheels , i might upgrade my ignition and get exhaust, but other than that im done for now.... any advice on how to get some traction.... Last edited by birdmanmdp; 01-08-2009 at 03:32 PM.

01-08-2009, 06:51 PM	#5
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	pt 1000#'s in the back for traction kinda defeats the build up though __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

01-08-2009, 08:06 PM	#8
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 6,374	he added up the numbers on the parts box. just pokin' bud. __________________ i'd rather be hunting

01-08-2009, 10:09 PM	#9
436'd skylark Senior Member Join Date: Mar 2007 Location: Buffalo Ny Posts: 661	[quote=birdmanmdp;87832]im puttin 380 to the wheels , iquote] sorry, but no way. not with tbi unless your spraying a 150 shot at it. I agree with 75. Although, I wouldn't go past 5800-6k. There is no way the stock prom would even support 300 at the wheels, or the crank really. But if you are making 380 at the wheels, the 700r sure ain't long for this world.. __________________ Joe 89 K2500 Chevy, Wee-Oh-five 285K miles, completly rebuilt needs a motor, bad 1962 IHC Scout All Wheel Drive (Scout speak for locking axles) 152 ci, dana everything else

01-08-2009, 03:01 PM	#2
75K30 Senior Member Join Date: Jul 2006 Posts: 2,992	You have not inccreased compression, and unless you plan on turning that engine past 6500 rpm, you bottom end is not affected. You really are not putting any additional strain on the bottom end. What other plans do you have? How much power are you making now?

01-08-2009, 05:18 PM	#4
batty1214 Senior Member Join Date: Nov 2008 Location: Vernal Utah Posts: 1,135	What kind of tire you running?

01-08-2009, 07:44 PM	#6
75K30 Senior Member Join Date: Jul 2006 Posts: 2,992	What TB are you using to suport 380 HP to the tires? What heads are on this thing? Conservative parasitic losses would mean that you have to be making in excess of 410 hp (conservative) at the crank to obtain a 380 RWHP figure. You mantioned intake, cam, and some headers. Do you have some magic in there to arrive at this figure? How did you confirm this? I only ask because of you are really making more than 1 hp per cubic inch, (not easy to do) then you have done some serious mods, and a stock cast crank will not support this for very long.

01-09-2009, 04:49 AM	#10
birdmanmdp Full Member Join Date: Jan 2009 Location: fayetteville, ga Posts: 16	i got an edelbrock power package that my father inlaw is puttin on for me that claims 410 horse, so he figures its around 380 to the wheels.... everything else is stock except the wires and plugs..... stock bottom end, tranny, and rear end..... its supposed to be all put back together saturday so im really just goin on what he tells me right now

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
F250 / 5.4 motor has a bottom end knock	mach	Ford Truck Forum	5	10-17-2008 12:14 AM
SsangYong Rexton Sells On Strength (carpages)	trucknews	Truck News (headlines)	0	02-03-2005 03:30 PM