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| hopper_74 |
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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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| raff-26 |
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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.
_________________ EF Ghia 5L V8 |
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| Scaffy |
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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.
_________________ Trickflow Street Heat top end kit, 70mm BBK TB & EGR, 24lb injectors, Underdrives & 3.73s: 275rwhp - 13.15@105mph NA / 12.37@116mph N20 |
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| hopper_74 |
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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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| Scaffy |
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You have solid lifters then?
Can you give us a run down on your engine specs? Can you not get a bigger MAF?
_________________ Trickflow Street Heat top end kit, 70mm BBK TB & EGR, 24lb injectors, Underdrives & 3.73s: 275rwhp - 13.15@105mph NA / 12.37@116mph N20 |
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| xafalcon |
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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.
_________________ XA Faimont 351C, AU2 XR8 Manual 5.0, DA LTD 5.0, Mk1 Capri 5.0, 1995 Mustang 5.0, EF2 XR8 Manual, EF2 Fairmont Ghia 5.0, AU3 XR8 Auto, AU2 XR8 Auto, AU2 XR8 Manual Ute, TE Cortina 5.0 Manual, DU LTD 5.0 soon to be manual |
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| skidder |
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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?
_________________ EVL098 wrote: Cramping in the hand from having it on your Wang for an excessive period of time is a definate con. Seriously do people google "f**k up modifications for Fords owned by Jews" and get linked straight to this site nowadays? AU,factory fitted tickford kit/IRS, t5,Sports ryder/KYB: gone. |
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| EBXR8380 |
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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..
_________________ As in ZOOM 126 edition |
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| hopper_74 |
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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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| Scaffy |
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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?
_________________ Trickflow Street Heat top end kit, 70mm BBK TB & EGR, 24lb injectors, Underdrives & 3.73s: 275rwhp - 13.15@105mph NA / 12.37@116mph N20 |
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| hopper_74 |
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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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| Scaffy |
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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...
_________________ Trickflow Street Heat top end kit, 70mm BBK TB & EGR, 24lb injectors, Underdrives & 3.73s: 275rwhp - 13.15@105mph NA / 12.37@116mph N20 |
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| XR9UTE |
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Get a 90mm Lightning MAF....that won't hold it back.
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