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| cuz351 |
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Hi fellas, I'm in need of a bit of advice on building a 6 cylinder engine up for a little cortina I plan to use as a fun drag car.
I've got an old 250 from a XF sitting here that needs a rebuild and I'd like some input as to what is the best way to go about it. I'm not after a 10 sec flyer, just a strong bottom end, N/A for starters, then a change to straight LPG and a small turbo later on. This all needs to be done on a budget and I don't mind if it takes a bit of time. A couple of mechanically minded mates are along for the ride and I'd rather try things out of the ordinary instead of following along a tried path I've read that a E-series crank will fit into a 250 block, apart from weight saving is there any other advantage to this? What head work needs to be done? Is it a better option to ditch the 250 xflow and drop a EF/EL I6 into it? Any help and ideas on this is much appreciated. Thanks guys Cuz
_________________ Who cares how it looks, power is everything, looks are for metrosexuals..... Last edited by cuz351 on Thu Sep 06, 2007 10:42 pm, edited 2 times in total. |
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| stockstandard |
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There are a couple of e-series cranks to choose from but they are all at least as heavy as the x-series and some are up to 4kg heavier (EF). They are however better balanced.
You cant really just build a hi-performance NA engine and then turbo it later. Pick one and build it. For a NA engine you want to build everything light and smooth with high compression and high rpm in mind. For boost you want beefy and strong with low compression and boost in mind. If you want to build either properly it will be the opposite approach to building the other. If you are building a NA engine, start with 200ci rods and the ACL pistons to suit. The extra rod length and compression will raise the redline and give you more power with the big cam you will be running. Pick a cam that will suit the rev range and power levels you are after (as well as what fuel and ignition - efi or carby). The XF heads have smallish ports so I am sure they will benefit from porting but I dont have much experience with those heads so wont offer any advice. Top the engine off with roller rockers to keep the valve train pumping along nicely at the higher rpm. If you look around the forums you will see some VERY good examples of 250 power corty's
_________________ Stoke me a clipper, I'll be back for Christmas |
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| ebxr82nv |
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THE XF MOTOR WILL PROBLY BE CHEAPER AND EASYER BUT PROBLY WONT MAKE THE POWER OF THE INJECTED MOTOR IF YOU WANT TURBO MAYBE LOOK AT A EFI 4.1 THERE IS SOME SIMPLE BUT EFFECTIVE SETUPS OUT THERE AN THE INTAKE IS JUST BUILT FOR IT
_________________ 9/98 AU1 XR6hp-about to retire from the road and be reborn on the race track. |
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| ELGT |
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Just buy a clevo and be done with it.
Stock it will run harder than aworked I6, and will be a shed load cheaper too. |
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| ebxr82nv |
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might be cheaper but not as much fun as when you pull up next to a v8 with the pipes dumping at the diff and you leave it in a cloud of tyre smoke
_________________ 9/98 AU1 XR6hp-about to retire from the road and be reborn on the race track. |
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| ELGT |
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ebxr82nv wrote: might be cheaper but not as much fun as when you pull up next to a v8 with the pipes dumping at the diff and you leave it in a cloud of tyre smoke
I wouldnt know......lol |
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| cjh |
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cuz351 wrote: Hi fellas, I'm in need of a bit of advice on building a 6 cylinder engine up for a little cortina I plan to use as a fun drag car.
I've got an old 250 from a XF sitting here that needs a rebuild and I'd like some input as to what is the best way to go about it. I'm not after a 10 sec flyer, just a strong bottom end, N/A for starters, then a change to straight LPG and a small turbo later on. This all needs to be done on a budget and I don't mind if it takes a bit of time. A couple of mechanically minded mates are along for the ride and I'd rather try things out of the ordinary instead of following along a tried path I've read that a E-series crank will fit into a 250 block, apart from weight saving is there any other advantage to this? What head work needs to be done? Is it a better option to ditch the 250 xflow and drop a EF/EL I6 into it? Any help and ideas on this is much appreciated. Thanks guys Cuz Here's one X-flow that hauled ar5e. Ran on premium ULP, ran 10:1 comp, crow cam, double valve springs, adjustable competition timing chain set, modified 600 vac sec Holley, ported head, port matched 4 barrel inlet, port matched Genie comp extractors, modified dizzy with MSD 6AL ignition, adjustable roller rockers, and is a 4 sp man. It had 265/70R15's on it and would smoke them in 3rd with a 2.92 LSD and no brakes used. It would rev to 6000 rpm. Unfortunately, an antipump-up lifter decided it had had enough, but wasn't being flogged at the time. So now the bits are for sale.
_________________ http://youtu.be/jJTh9F3Vgg0 |
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| cuz351 |
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Thanks for the replies fellas. My decision on wether or not to turbo it has been made. I just got back from picking these bits up:
Turbo is a HT18S-2S Intercooler is from a BA turbo with less than 30,000kms on it 3" dump pipe Homemade log style manifold Well now it looks like I need to build a crossflow capable of handling boosted strip duties and find a suitable TC cortina to put it all in.
_________________ Who cares how it looks, power is everything, looks are for metrosexuals..... |
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| Private9 |
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Good stuff mate, shuold make for a real surprise!
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| Molloy |
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What times did that ute do? any power read outs?
_________________ SS Inductions CAI, K&N Filters, M-spec FMC, Turbosmart BOV, 8psi capa tune, X-force cat. |
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| cjh |
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Molloy wrote: What times did that ute do? any power read outs?
It was punching out 170+ HP at the wheels ( the big wheels and the 2.92 diff gears ). It needed more tweeking, but alas it didn't get there, so now a 351C is going in it now. Not sure on how far he wants to go with that.
_________________ http://youtu.be/jJTh9F3Vgg0 |
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| cuz351 |
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Nice. Anyone have a rundown on a build list for me? I read that 200 rods in a 250 make it very strong
_________________ Who cares how it looks, power is everything, looks are for metrosexuals..... |
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| cjh |
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cuz351 wrote: Nice. Anyone have a rundown on a build list for me? I read that 200 rods in a 250 make it very strong
If you run 200 rods in a 250, you need to use the special pistons for that setup. It changes the stroke to rod-length ratio. It the same when using 302C rods in a 351C. ACL make those pistons for it.
_________________ http://youtu.be/jJTh9F3Vgg0 |
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| cuz351 |
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Righto.
What kind of work do I get done to the head?
_________________ Who cares how it looks, power is everything, looks are for metrosexuals..... |
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| cjh |
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The usual 3 angle valve cut, with back cut inlets, tidy up the ports, and port-match them. Use a high volume oil-pump using a 15W engine oil with an engine oil cooler.
_________________ http://youtu.be/jJTh9F3Vgg0 |
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