What Happens with 18PSI of Boost??

Russellb · Postby **Russellb** » Mon Jun 16, 2008 8:08 pm

Well after a great Saturday of racing at Oran Park
I Did this to the Engine

No4 The broken one also cracked the Block on both sides
O Well thats Racing

A big thanks To Turbo Girl for Letting me use her car on Sunday

Hellmun · Postby **Hellmun** » Mon Jun 16, 2008 9:19 pm

Are those the standard pistons out of an NB Russel?

Russellb · Postby **Russellb** » Tue Jun 17, 2008 8:46 am

Hellmun wrote:Are those the standard pistons out of an NB Russel?

Yep Stock Pistons and Rods
New Beams on there way

Casey · Postby **Casey** » Tue Jun 17, 2008 9:31 am

You took the bits home to put on the lounge room floor??!!

Some nice work there - was it the 18lb boost or the 10,000rpm buzz or both? I can't see too clearly in the pictures, but the pistons look okay. Tuning must be spot on?

I dropped by last night to say hi - saw Turbo Boy on the hoist less engine (you don't muck around).

No one was around, so I pinched the beer money left out on the smoko table for counting and made a quick escape :mrgreen:

CT · Postby CT » Tue Jun 17, 2008 1:03 pm

Nice work Russ

Benny · Postby **Benny** » Tue Jun 17, 2008 5:19 pm

The standard engines do have soft rods.
They are fine for any NA engine, but if you want to run more than 5 or 6 lbs of boost (less than 0.5 atm), you'll need stronger rods.

I bet that every SP out there has at least one bent rod in the block, even if it is stock standard.

An engine builder, who specialises in Mazda motors told me that he bought a burned out SP which only had 10,000k's on it, and even it had 2 slightly bent rods.

Invest in some forged rods, and you'll be fine at 18lbs.

Hellmun · Postby **Hellmun** » Tue Jun 17, 2008 6:13 pm

Hmm

When I make that SP replica one day I'll have to remember never to go over 17.5psi just to be on the safe side :mrgreen:

Sean · Postby **Sean** » Tue Jun 17, 2008 7:08 pm

We found it was torque rather than power that broke bits for us, probably a completely different story in a race car dríven hard all the time then a street car that rarely see's high boost.

Postby **Boyracer** » Tue Jun 17, 2008 10:32 pm

I was right behind Russel when it happened...looked very spectacular...

Pilsner · Postby **Pilsner** » Wed Jun 18, 2008 9:29 am

I think the 11,000 revs Russell hit at Bathurst (wrong gear) rather helped in the curvature of the rods, meaning that they were slightly bent already before Oran Park

Dave · Postby **Dave** » Sun Jun 22, 2008 1:57 pm

Benny wrote:The standard engines do have soft rods.
They are fine for any NA engine, but if you want to run more than 5 or 6 lbs of boost (less than 0.5 atm), you'll need stronger rods.

I bet that every SP out there has at least one bent rod in the block, even if it is stock standard.

I don't think so George... over 170,000k, mostly on 10+ lbs (for a short while 13 :shock:

) and not an issue.
You don't tend to drive around for too long with a bent rod before something tries to escape from your block!
(probably jinxed myself now... :lol:

)

Blue94t · Postby **Blue94t** » Sun Jun 22, 2008 9:56 pm

I ran 15psi on a stock BP for ~6000kms, probably 1000 of them on the track. The motor was turbo for 40,000kms and was running fine when I pulled it out.
Jake

Benny · Postby **Benny** » Mon Jun 23, 2008 2:21 pm

Dave wrote:
Benny wrote:The standard engines do have soft rods.
They are fine for any NA engine, but if you want to run more than 5 or 6 lbs of boost (less than 0.5 atm), you'll need stronger rods.

I bet that every SP out there has at least one bent rod in the block, even if it is stock standard.

I don't think so George... over 170,000k, mostly on 10+ lbs (for a short while 13 ) and not an issue.
You don't tend to drive around for too long with a bent rod before something tries to escape from your block!
(probably jinxed myself now... )

My car was running fine too when I had the engine taken out.
You might think you don't have any bent rods, but I bet that when you take the engine out, and check them, you might get a surprise!