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PostPosted: Sat Mar 10, 2018 8:21 pm 
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Full Pressure Turbo

Joined: Sun Jan 20, 2013 12:45 pm
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Location: South Norfolk
Car Model: 9-5 DE Aero stage 3+ Quaife
As title states when forging the B235R for reliability over 310/320bhp is it just pistons needed or rods as well?

Jimbo

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PostPosted: Sat Mar 10, 2018 10:52 pm 
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Barrelling Along
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Car Model: 9-5 Aero
Depends on the power and torque figures you have in mind coupled with the intended rev limit and use of the engine that is planned.

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PostPosted: Sun Mar 11, 2018 10:26 am 
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Full Pressure Turbo

Joined: Sun Jan 20, 2013 12:45 pm
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Location: South Norfolk
Car Model: 9-5 DE Aero stage 3+ Quaife
Just want reliability. Currently not planning anything above 320 to 350

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PostPosted: Sun Mar 11, 2018 2:03 pm 
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Location: Fliptop Towers, North Yorks...the flat bit.
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Stock rods are fine.

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PostPosted: Sun Mar 11, 2018 2:07 pm 
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Full Pressure Turbo

Joined: Sun Jan 20, 2013 12:45 pm
Posts: 954
Location: South Norfolk
Car Model: 9-5 DE Aero stage 3+ Quaife
Need the quaife 1st. Later in the year perhaps. I just want a nice reliable safe and useable car. I want to be able to get the max out of what rcp has atm (310-315 perhaps) then look at a bit more power.

Thanks guys

Jimbo

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PostPosted: Mon Mar 12, 2018 10:38 am 
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UKSaabs Trader
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Car Model: 9-5 - The dark dame
IMHO i would say pistons only up to 400hp and then rods as well above that.

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PostPosted: Mon Mar 12, 2018 10:41 am 
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Full Pressure Turbo

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Car Model: 9-5 DE Aero stage 3+ Quaife
Cheers Karl

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PostPosted: Wed Mar 14, 2018 9:20 am 
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Full Pressure Turbo

Joined: Sun Jan 20, 2013 12:45 pm
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Location: South Norfolk
Car Model: 9-5 DE Aero stage 3+ Quaife
So having done some more reading up it seems actually that forged pistons are generally heavier than cast as I'm sure most of you knew :wall:

This leads me to asking is it still a good idea to change the rods at the same time as heavier pistons will create more kinetic energy/stress on the pistons as they hit TDC then start on the down stroke?

Jimbo

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PostPosted: Sun Mar 25, 2018 8:34 pm 
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Location: South Wales M4 J27/28
Car Model: 2009.5 9-5 2.3T TE St4 Auto
JMF894 wrote:
So having done some more reading up it seems actually that forged pistons are generally heavier than cast as I'm sure most of you knew :wall:

This leads me to asking is it still a good idea to change the rods at the same time as heavier pistons will create more kinetic energy/stress on the pistons as they hit TDC then start on the down stroke?

Jimbo


Strange - the generally accepted numbers are that forged pistons and rods together save about 2kg on total so maybe the rods are massively lighter??

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PostPosted: Sun Mar 25, 2018 9:25 pm 
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Full Pressure Turbo

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Car Model: 9-5 DE Aero stage 3+ Quaife
This was one forum. Everyone else states they are lighter. This forum suggested forged material in general was heavier than cast. It wasn't brand specific.

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PostPosted: Wed Mar 28, 2018 8:05 pm 
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Joined: Sun Feb 17, 2013 6:20 pm
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Car Model: Saab 9-5 Aero 2004
The pistons are lighter but the rods are massively so as they’re a much different design, essentially two plates joined by a ferrule / bushing at either end. I can’t remember the weight difference but I’m sure it would tell you on the Wossner and PEC sites.

I’ve got both in mine and the sped the engine revs is night and day from the stock ones.


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PostPosted: Wed Mar 28, 2018 8:09 pm 
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Full Pressure Turbo

Joined: Sun Jan 20, 2013 12:45 pm
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Location: South Norfolk
Car Model: 9-5 DE Aero stage 3+ Quaife
So am I correct in thinking that although the engine is giving no more power it will accelerate quicker due to being able to rev faster through less inertia?

Jimbo

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PostPosted: Wed Mar 28, 2018 8:17 pm 
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Joined: Fri Apr 24, 2009 5:33 pm
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Location: Derbyshire
Car Model: 9-3ss Aero + og93 RWD trackcar
JMF894 wrote:
So am I correct in thinking that although the engine is giving no more power it will accelerate quicker due to being able to rev faster through less inertia?

Jimbo


Yes, lightened flywheel is also a good mod for this.

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PostPosted: Wed Mar 28, 2018 8:28 pm 
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Full Pressure Turbo

Joined: Sun Jan 20, 2013 12:45 pm
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Location: South Norfolk
Car Model: 9-5 DE Aero stage 3+ Quaife
Yes indeed I would get the flywheel when having quaife fitted.

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