how much boost for hyperkraptic pistons? - Ford Mustang Forums : Corral.net Mustang Forum
 
LinkBack Thread Tools Display Modes
post #1 of 8 Old 04-10-2007, 07:55 PM Thread Starter
Registered User
 
Trader Feedback: (48)
Join Date: Apr 2005
Location: arizona
Posts: 515
how much boost for hyperkraptic pistons?

how much can they handle? i have a 351 .30 over

showoff is offline  
Sponsored Links
Advertisement
 
post #2 of 8 Old 04-10-2007, 10:40 PM
 
Trader Feedback: (13)
Join Date: Jun 2005
Posts: 890
My old stock motor '95 GT took 13psi from my intercooled P1SC.....When I traded it off, it had 103,000 miles on it....Only the last 10,000 miles was on boost.....Never gave me any problems....Can't really say for sure with yours, every motor is different.....What one motor lets go at doesn't mean that the next would at the same boost level......If you have a REAL safe tune, I'd say no more than 11-12psi......

TFScoupe is offline  
post #3 of 8 Old 04-11-2007, 03:48 PM
Registered User
 
TurboJunky's Avatar
 
Trader Feedback: (7)
Join Date: Aug 2006
Location: Central NY
Posts: 536
I had a set in a 351W with a B+M mini blower on it, 8#s of boost. I over reved the motor at the track and broke the ring lands off of all the pistons on the drivers side. All the chunks (about 1 1/2" long each) went out the exhaust. I will never build another performance engine with hypereutectic pistons, they leave for no margine for error.

1979 Mustang coupe, EFI 393, A/A intercooled Eaton m122, 4r70w trans, Megasquirt II, T-top swapped in.

1990 Mustang, 545 BBF, C-4 with brake, ladder bars, tunnel ram with two Predator carbs, solid roller cam, 9", 390/45r15 drag radials.
TurboJunky is offline  
Sponsored Links
Advertisement
 
post #4 of 8 Old 04-11-2007, 08:02 PM
 
Trader Feedback: (0)
Join Date: Feb 2007
Posts: 36
I'm running 13lbs of boost on hypercrappy pistons, course it's only been a week since it's been upped to that...
scottm93GT is offline  
post #5 of 8 Old 04-11-2007, 08:11 PM
Registered User
 
Trader Feedback: (9)
Join Date: Feb 2006
Location: Austin Tx
Posts: 408
As with anything the trick in the tune...but 13psi seems alot to me. I would stick below that 13psi...10psi or so, depending on pulley. I busted a 96 440rwhp cobra with 11-12 psi after a year or so of "having a good time". Different motor all together but still keep it safe if you want this to last long.

65 Mustang
68 Barracuda 440
boostdidfox is offline  
post #6 of 8 Old 04-22-2007, 05:38 AM
 
Trader Feedback: (0)
Join Date: Apr 2007
Posts: 13
My stock bottom end 302 H/C/I in my 95 held 12psi with a Vortech S-trim non intercooled with 42 lb inj for 3 years making 508rwhp 489 lb ft tq.it didn't break until the boost was upped to 16psi and made 570rw and noticed under full throttle the oil. press would drop suddenly so when it was taken apart the pistons were perfect but the block was broken in 3 places. The motor had 86,000 on it when I put the blower on it ,It had a Nitrous express kit on it for 2 years prior to that with a 90 shot on it , the car weighed 3420lbs and ran 11.20 at 126 consistantly.....never even blew a gasket....no failures at all , 93 octane splashed with 114 octane 5 spd 3.73 gear and Et streets 28x11.50-15....not the radials.....the hyperuetectics are actually pretty tough , its all in the tune ....50lbs of fuel press at idle 60 under boost , 10deg initial timing
347pace_car is offline  
post #7 of 8 Old 04-23-2007, 02:49 PM
Registered User
 
quarterstang86's Avatar
 
Trader Feedback: (1)
Join Date: Sep 2000
Location: Atlanta,Ga,USA
Posts: 655
Lidio out of Alternative went 9's in his street car (yellow coupe) with a stock lightning shortblock and Vortech boost thru a near stock AODE.

Simple enough - it's all in the correct tune.
quarterstang86 is offline  
post #8 of 8 Old 04-27-2007, 11:16 PM
Registered User
 
Trader Feedback: (4)
Join Date: Jul 2005
Location: sf ca
Posts: 301
any piston will blow up if detonated against enough, the hypers just go earlier. tune or die.
kingmoochr is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Mustang Forums : Corral.net Mustang Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome