Crankshaft opinions wanted

acmillr · June 23rd, 2007, 10:37 PM

I'm building a new shortblock right now and I have a good 6 bolt crank on hand. Do you guys think I should go ahead and get the 8 bolt Cobra crank or just use the cast crank? I'm putting together a 10.3:1 motor and I plan on spraying atleast a 150 HP shot of n2o. I am trying to weigh this decision carefully, because I already have a Spec aluminum flywheel for a 6 bolt, but I don't want to take chances with a new motor on a weak crank either. How much power is the 6 bolt crank good for any way? I have heard around 600, but I never seen any proof of this.

01GT · June 23rd, 2007, 10:47 PM

ive heard our 6 bolt is good for anywhere around 550-600 rwhp... yet i really haven't heard of a gt breaking a crank... probably because everyone running gobs of hp already swapped out for a forged crank. imho its better to be on the safe side.

Invictus · June 24th, 2007, 04:50 AM

i'd say do it right the first time and never look back. 8 bolt ftw!

DrHolliday · June 24th, 2007, 05:15 AM

I highly doubt you'll break a crank man.

If you ever plan on going higher than 650 rwhp I would change it. I say 650 b/c I have heard 600 but here never heard of a crank breaking in one of these cars.

Can you buy a forged 6 bolt crank, or are they all 8 bolt once their forged?

Drgnracin72 · June 24th, 2007, 10:27 AM

i say go ahead and go for the forged cobra crank. its a little more expensive, but its extra insurance against something breaking. the cast crank in these cars are pretty stout and able to handle over 600 hp but do you want to have to buy a complete new long block becasue yours let go early. i wouldnt. i say do ti right the first time and spend the extra $$$$ on the forged stuff, recoup your costs by selling the 6 olt and flywheel

superbeef1000 · June 24th, 2007, 11:44 AM

Go with forged it will take the abuse better ,, hell if your going to do the crank you might as well go with some nice I beam rods and some good pistons to if you haven’t all ready

acmillr · June 24th, 2007, 12:21 PM

Originally Posted by superbeef1000

Go with forged it will take the abuse better ,, hell if your going to do the crank you might as well go with some nice I beam rods and some good pistons to if you haven’t all ready

I'm ordering some manley h-beams and I'm undecided on piston brand at the moment, but they will def. be forged. I'm still looking at options on flat tops with some serious valve reliefs.

acmillr · June 24th, 2007, 12:22 PM

Originally Posted by DrHolliday

I highly doubt you'll break a crank man.

If you ever plan on going higher than 650 rwhp I would change it. I say 650 b/c I have heard 600 but here never heard of a crank breaking in one of these cars.

Can you buy a forged 6 bolt crank, or are they all 8 bolt once their forged?

All forged cranks are 8 bolt, but not all 8 bolts are forged- if you follow that.

acmillr · June 24th, 2007, 03:43 PM

Well, on a side note, I let my oldest daughter (3) pick the color for the new block. Was it a mistake? You be the judge........

SWEET2KSTANG · June 24th, 2007, 04:16 PM

it is an attention graaber! the crank will hold quiet a bit of power, a 6 bolt flywheel would be the least of my worries. spec makes great products, talk to them about the application. if nitrous is all the only power adder you will be running, i would up the compression a little more. when building a nitrous motor, you dont have to worry about how much compression you run. just make sure the bottom end is strong. if it were boost, the compression ratio would have to drop.

Invictus · June 24th, 2007, 04:16 PM

No, i'd say she did a rite fine job. Looks pretty badass imo.

acmillr · June 24th, 2007, 04:23 PM

Originally Posted by SWEET2KSTANG

it is an attention graaber! the crank will hold quiet a bit of power, a 6 bolt flywheel would be the least of my worries. spec makes great products, talk to them about the application. if nitrous is all the only power adder you will be running, i would up the compression a little more. when building a nitrous motor, you dont have to worry about how much compression you run. just make sure the bottom end is strong. if it were boost, the compression ratio would have to drop.

I don't want to go too high. I built an 11:1 motor a few years ago and had problems with as quality. I'm going to sty under 10.5:1 with this one.

DrHolliday · June 24th, 2007, 05:04 PM

Love the green block man. I've always liked to do things different than the norm.

acmillr · June 24th, 2007, 05:22 PM

Originally Posted by DrHolliday

Love the green block man. I've always liked to do things different than the norm.

Yeah, I think it will be cool to pop the hood and see what kind of comments I get. I'm going to go ahead and paint the front cover and the heads the same color.

superbeef1000 · June 25th, 2007, 11:15 AM

now that is a brite green , it will be an eye catcher for sure

Garhfer · June 25th, 2007, 11:23 AM

heh, that's an interesting block color for sure!

04GTAMPA · June 25th, 2007, 12:21 PM

Looks good. Fine job!

June 23rd, 2007, 10:37 PM	#1
acmillr MM's Mad Scientist Slow Fella Join Date: Jul 2006 Location: Tupelo, MS Posts: 5,120 iTrader: 2 reviews	Crankshaft opinions wanted I'm building a new shortblock right now and I have a good 6 bolt crank on hand. Do you guys think I should go ahead and get the 8 bolt Cobra crank or just use the cast crank? I'm putting together a 10.3:1 motor and I plan on spraying atleast a 150 HP shot of n2o. I am trying to weigh this decision carefully, because I already have a Spec aluminum flywheel for a 6 bolt, but I don't want to take chances with a new motor on a weak crank either. How much power is the 6 bolt crank good for any way? I have heard around 600, but I never seen any proof of this. __________________

June 23rd, 2007, 10:47 PM	#2
01GT Regular Join Date: May 2007 Location: NAS Lemoore, CA Posts: 227 iTrader: 0 reviews	ive heard our 6 bolt is good for anywhere around 550-600 rwhp... yet i really haven't heard of a gt breaking a crank... probably because everyone running gobs of hp already swapped out for a forged crank. imho its better to be on the safe side. __________________ Don't buy from this guy: 1fstmach1

June 24th, 2007, 05:15 AM	#4
DrHolliday Enthusiast Join Date: Mar 2007 Location: New Port, NC Posts: 717 iTrader: 0 reviews	I highly doubt you'll break a crank man. If you ever plan on going higher than 650 rwhp I would change it. I say 650 b/c I have heard 600 but here never heard of a crank breaking in one of these cars. Can you buy a forged 6 bolt crank, or are they all 8 bolt once their forged? __________________ Mustangless atm 2006 2500 HD Diesel. Built allison trans and other goodies

June 24th, 2007, 10:27 AM	#5
Drgnracin72 I Post Entirely Way Too Much Join Date: Jan 2006 Location: somewhere in oklahoma Posts: 10,638 iTrader: 2 reviews	i say go ahead and go for the forged cobra crank. its a little more expensive, but its extra insurance against something breaking. the cast crank in these cars are pretty stout and able to handle over 600 hp but do you want to have to buy a complete new long block becasue yours let go early. i wouldnt. i say do ti right the first time and spend the extra $$$$ on the forged stuff, recoup your costs by selling the 6 olt and flywheel __________________ RIP ΜΟΛΩΝ ΛΑΒΕ Political Correctness is a doctrine, fostered by a delusional, illogical, liberal minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end. One Big Ass Mistake America SHEEPDOGS

June 24th, 2007, 11:44 AM	#6
superbeef1000 Hardcore Enthusiast Join Date: Aug 2006 Location: mesa , arizona Posts: 1,475 iTrader: 2 reviews	Go with forged it will take the abuse better ,, hell if your going to do the crank you might as well go with some nice I beam rods and some good pistons to if you haven’t all ready __________________ a bunch of stuff to make my car faster http://www.moddedmustangs.com/forums...e-member-1497/

June 24th, 2007, 04:50 AM	#3
Invictus Hardcore Enthusiast 1999 Mustang Join Date: Jul 2006 Posts: 1,355 iTrader: 0 reviews	i'd say do it right the first time and never look back. 8 bolt ftw!

June 24th, 2007, 03:43 PM	#9
acmillr MM's Mad Scientist Slow Fella Join Date: Jul 2006 Location: Tupelo, MS Posts: 5,120 iTrader: 2 reviews	Well, on a side note, I let my oldest daughter (3) pick the color for the new block. Was it a mistake? You be the judge........ __________________

June 24th, 2007, 04:16 PM	#10
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,430 iTrader: 8 reviews	it is an attention graaber! the crank will hold quiet a bit of power, a 6 bolt flywheel would be the least of my worries. spec makes great products, talk to them about the application. if nitrous is all the only power adder you will be running, i would up the compression a little more. when building a nitrous motor, you dont have to worry about how much compression you run. just make sure the bottom end is strong. if it were boost, the compression ratio would have to drop. __________________ project warhorse under construction being built by MP2 Performance

June 24th, 2007, 05:04 PM	#13
DrHolliday Enthusiast Join Date: Mar 2007 Location: New Port, NC Posts: 717 iTrader: 0 reviews	Love the green block man. I've always liked to do things different than the norm. __________________ Mustangless atm 2006 2500 HD Diesel. Built allison trans and other goodies

June 25th, 2007, 11:15 AM	#15
superbeef1000 Hardcore Enthusiast Join Date: Aug 2006 Location: mesa , arizona Posts: 1,475 iTrader: 2 reviews	now that is a brite green , it will be an eye catcher for sure __________________ a bunch of stuff to make my car faster http://www.moddedmustangs.com/forums...e-member-1497/

June 25th, 2007, 11:23 AM	#16
Garhfer Hardcore Enthusiast 2004 Mustang GT Conv. Join Date: Mar 2007 Location: Edgewater, FL Posts: 1,790 iTrader: 0 reviews	heh, that's an interesting block color for sure! __________________ 2004 GT Boosted by Vortech

June 25th, 2007, 12:21 PM	#17
04GTAMPA Hardcore Enthusiast 2001 Mustang SVT Cobra Join Date: Apr 2007 Location: Riverview, FL Posts: 2,751 iTrader: 1 reviews	Looks good. Fine job! __________________ Slow, really slow Cobra. Wanna see? MM Cobra Club Member #81 "TAMPA BAY AREA CREW"

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