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Making the i6 motor rev? 

 

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 Post subject: Making the i6 motor rev?
Posted: Sat Jul 10, 2010 10:53 pm 
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Im in the middle of building a quick motor for my EA fo half track work and weekend driving and would like it be able to get more rpm from the motor what do you need to do the these motors to make them rev safely to 7k or more

I will be using a EA block with ether new el pistons, rods and crank or 5k old Au pistons, rods and crank no matter what bottom end im going to end up using it will be getting a full balance sure

just not sure what rpm i will be able to get to safely and what else hold back these motors from pulling higher rpms

 

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 Post subject: Re: Making the i6 motor rev?
Posted: Sat Jul 10, 2010 11:16 pm 
Getting Side Ways
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6000rpm MAX. you will stretch the rods if you pull more than that!

 

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 Post subject: Re: Making the i6 motor rev?
Posted: Sat Jul 10, 2010 11:58 pm 
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are the standard rods that crappy?

ok what rods should i be looking at that will handle 7k rpm

 

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 Post subject: Re: Making the i6 motor rev?
Posted: Sun Jul 11, 2010 12:27 am 
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 Post subject: Re: Making the i6 motor rev?
Posted: Sun Jul 11, 2010 8:33 am 
Getting Side Ways
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Rev any higher than 6200RPM and your pistons will fly though the bonnet!!! If you want a car that revs out, get a Honda LOL :)

Laticia.

 

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 Post subject: Re: Making the i6 motor rev?
Posted: Sun Jul 11, 2010 10:27 am 
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TWiZTiD wrote:
and what else hold back these motors from pulling higher rpms


bore x stroke ratio.
falcons are undersquare.

if you want high revving, you want oversquare.
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 Post subject: Re: Making the i6 motor rev?
Posted: Sun Jul 11, 2010 12:06 pm 
Getting Side Ways
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Sommers NL wrote:
Rev any higher than 6200RPM and your pistons will fly though the bonnet!!! If you want a car that revs out, get a Honda LOL :)

Laticia.

Pistons don't fly through the bonnet, just stretch rods and hit the head.

 

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 Post subject: Re: Making the i6 motor rev?
Posted: Sun Jul 11, 2010 12:11 pm 
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67RCE wrote:
Sommers NL wrote:
Rev any higher than 6200RPM and your pistons will fly though the bonnet!!! If you want a car that revs out, get a Honda LOL :)

Laticia.

Pistons don't fly through the bonnet, just stretch rods and hit the head.


i have reved my au engine to 6500rpm a couple of times and had seen 6800 on one occassion..
but generally my rev limit is set to 6000rpm. as it stops making power here..

maybe i should check if the pistons are still there??? :lol: :lol:
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 Post subject: Re: Making the i6 motor rev?
Posted: Sun Jul 11, 2010 12:53 pm 
Getting Side Ways
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I know a dude with a speedway car, ( looks like an EL ), it revs to 7500rpm....Microtech ECU, std crank, std rods, std pistons....but modified rockers.....solids, no HLA's.....and a monster camshaft that is a " Misgrind ".
He is currently working on another donk now, std bottom end ( EL Hybrid ), modified pistons, highly modified head, still using injection.
It may be ready in about 2 months or so, for next season.
Will be interesting to see how it goes.

 

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 Post subject: Re: Making the i6 motor rev?
Posted: Sun Jul 11, 2010 12:59 pm 
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oversquare motors can rev, its just the physics make it harder, but not impossible.

The 6.5 liter murcielago engine is oversquare, and makes its 631 hp at 8,000 rpm. Not sure what the redline is but with peak power at 8000, it could be anywhere 8,500 to 9000.

rod to stroke ratio's make a difference so Im told.

When they test these i6 motors they test them beyond what they are set at out of the factory as a margin of safety. I think the valve train would go before the bottom end when revving over 6k.

This isnt verifyed, only heresay, but in discusions Ive been told the ford aus tested the au six to 7000 rpm safely, but set the rev limit much lower for reliability.

 

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 Post subject: Re: Making the i6 motor rev?
Posted: Sun Jul 11, 2010 1:44 pm 
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Sommers NL wrote:
Rev any higher than 6200RPM and your pistons will fly though the bonnet!!! If you want a car that revs out, get a Honda LOL :)

Laticia.


You're not from the housing commissions of Dapto by any chance? They all seem to think that pistons put holes in bonnets and go into orbit when you rip a mean skid.
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 Post subject: Re: Making the i6 motor rev?
Posted: Sun Jul 11, 2010 2:39 pm 
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I have a AU motor in my wagon that gets reved regularly to 6500 - 7000 rpm

My AU motor sings when i rev it out, I'm running a wade 1645 grind which makes power from 3500 - 7000 that probably helps the engine rev. otherwise standard motor.

 

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 Post subject: Re: Making the i6 motor rev?
Posted: Sun Jul 11, 2010 3:17 pm 
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Ride: EA 2, Sierra, Au1 XR 6

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Now im really confused

So it seems they can rev to 6500 to 7000 with no mods just now need to make up my mind on what crank and what rods and pistons.

 

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10/89 EA 11 Spac 5 Speed, Being Rebuilt From The Ground Up
87 Sierra To much to list all the mods
99 Au1 XR6 5 speed stock as a rock

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 Post subject: Re: Making the i6 motor rev?
Posted: Sun Jul 11, 2010 3:21 pm 
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TWiZTiD wrote:
Now im really confused

So it seems they can rev to 6500 to 7000 with no mods just now need to make up my mind on what crank and what rods and pistons.


Use an AU bottom end....that easy.

 

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 Post subject: Re: Making the i6 motor rev?
Posted: Sun Jul 11, 2010 3:22 pm 
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TWiZTiD wrote:
Now im really confused

So it seems they can rev to 6500 to 7000 with no mods just now need to make up my mind on what crank and what rods and pistons.


and obviously you also need an aftermarket ecu or a j3 chip modification to dissable the factory rev limit..
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