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what can i safely rev my 5l to? 

 

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 Post subject: what can i safely rev my 5l to?
Posted: Fri Jul 31, 2009 12:25 pm 
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i was just wondering what i clould safely take my el xr8 to is done 135k
stock bottem end i had it at 5800 last time on the dyno
the cam ive got will go well past 6000 i was hopeing 2 go 2 6200?
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 Post subject: Re: what can i safely rev my 5l to?
Posted: Fri Jul 31, 2009 12:38 pm 
Getting Side Ways
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What mod's do you have?

Anyone will tell you a stockish Windsor doe's not effectively/nor like to rev past 4,500rpm anyway's..there is no point with them doing so as power drops off at around 4,100....

But cam, explorer mani, gt40p or trickflow heads = AIRFLOW so that's a different story - still not a revvy motor though- and was never meant to be.

 

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 Post subject: Re: what can i safely rev my 5l to?
Posted: Fri Jul 31, 2009 1:16 pm 
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I've got my rev limiter set at 6000rpm, but never take it there unless by accident. It's hit it a few times and I have about 220k on the clock. From what I understand, the hydraulic lifters don't like to go over 6000rpm anyway as that's where valve float begins to happen. I'm just going from what I've read and don't have any real-world experience with this.

 

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 Post subject: Re: what can i safely rev my 5l to?
Posted: Fri Jul 31, 2009 1:33 pm 
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ive done every thing hole top end lifters and bigish cam 1000 cfm tbl im
just working on gettin rid of the maf coz its holding the airflow back
i wont have a problem with valve float.
i was hoping ppl had taken them past 6000 but i dont want to blow it up eather
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 Post subject: Re: what can i safely rev my 5l to?
Posted: Sat Aug 01, 2009 3:05 am 
Getting Side Ways
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Ride: EL XR8, '08 Mondeo XR5t

Power: 205 rwkw

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WA, Australia

You have solid lifters then?

Can you give us a run down on your engine specs?

Can you not get a bigger MAF?

 

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 Post subject: Re: what can i safely rev my 5l to?
Posted: Sat Aug 01, 2009 8:15 am 
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I wouldn't go past 6k unless you've fitted HP rod bolts like ARP. If you have then 6.2k will be OK for short bursts so long as your valvetrain is capable like you say it is. Revs break engines and rod bolts are the most critical fastener in the engine. Following the rod bolts, the next best insurance is a full balance job.

 

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 Post subject: Re: what can i safely rev my 5l to?
Posted: Sat Aug 01, 2009 7:09 pm 
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Assuming it was built and balanced correctly the bottom end shouldn't pose any problems even up to 7000rpm. Still haven't stated whether a solid cam is being run?

 

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 Post subject: Re: what can i safely rev my 5l to?
Posted: Sun Aug 02, 2009 1:25 am 
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Believe it or not the rods are usually fine.. Its the piston speed that breaks pistons...
If it breaths and pulls all the way through?? 6500 is fine as long as valves etc are hanging in there..
When rods break ?? There is usually something else that caused it !!
Often a broken valve, run bearing etc..
Std heads ?? pulling more than 5000 rpm is a waste of time!!
Sad really when the 5.0 has a nice bore stroke ratio and cannot rev to it's ability...
Due to very restrictive induction...
YET the 6's with their LONG stroke could actually rev much higher..

 

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 Post subject: Re: what can i safely rev my 5l to?
Posted: Sun Aug 02, 2009 12:41 pm 
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i have a custom grind cam with 581 lift and 223 duration crane hydraulic lifters crow push rods 1.6 yella terra ajb rollers (pro comp heads 180cc i no i no) i had on a flow bench at my cam lift they flow 470 hp manly valves dbl row springs extractors un sure what brand mabie el gt?? victor jr intake (modified) holly 1000cfm tb. at the min it has a gas carbie hat on top coz i still hav 2 run the maf witch is holding it back ALOT. i got 210rwkw @5800 i said not to worrie about going to 6k because its so restricted
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 Post subject: Re: what can i safely rev my 5l to?
Posted: Sun Aug 02, 2009 1:32 pm 
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I wouldn't worry about EL GT extractors. Sounds like you'll be needing some Defilippo 1 3/4", 4 into 1s.

What have you done to the bottom end?

 

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When injustice becomes law, resistance becomes duty

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 Post subject: Re: what can i safely rev my 5l to?
Posted: Sun Aug 02, 2009 1:39 pm 
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the bottem end is dead stock never been out of the car.
extractors im not sure about mine they are 4 into 1s and 1 5/8"
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 Post subject: Re: what can i safely rev my 5l to?
Posted: Mon Aug 03, 2009 4:11 am 
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Ride: EL XR8, '08 Mondeo XR5t

Power: 205 rwkw

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WA, Australia

It'd be a toss up between the Defilippos or Pacemaker tri-ys. A lot of people would argue the Defilippos will be too big and they could be right, but I'm pretty happy with the performance I'm getting out of them. I'll be trying the tri-ys in a few weeks and will be doing a dyno comparison to see what the difference is.

I didn't think we'd be able to run lift as high as you have on engines like ours with stock bottom end. I might start looking for a bigger cam...

 

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Trickflow Street Heat top end kit, 70mm BBK TB & EGR, 24lb injectors, Underdrives & 3.73s: 275rwhp - 13.15@105mph NA / 12.37@116mph N20

When injustice becomes law, resistance becomes duty

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 Post subject: Re: what can i safely rev my 5l to?
Posted: Tue Aug 04, 2009 12:30 am 
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Get a 90mm Lightning MAF....that won't hold it back.
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