Enkei74

Another old Melbourne XF Turbo originally built in the early 00's. Has hemi rods also.

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I'm struggling to understand why anyone would make an already undersquare engine even more so. Maybe more off-boost torque? Crank harmonics would also get worse with smaller journals and less overlap. Hardly worth the trouble if you ask me.

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Yeah, I am not sure about the pistons, something forged. Yes, definitely had an offset ground crank. It's weird the things you remember.

Chev pistons on Hemi rods... that's the combo from memory, yeah.
Offset ground crank too, isn't it?

Georges XF was one an early turbo build
He used Chevy conrods, and the block is grout filled, to the bottom of the welsh plugs.
 
 

XE GP Turbo ride along -
 

that said, slydog's one revs past 7000.. far from stock though

I’ve got all the bits to do a Crossflow turbo build for my XF Ghia, time and enthusiasm are lacking...

However my goal has never been about max dyno numbers, more around how it goes and feels.

My build is exactly what all the above are giving advice on, fresh bottom end, MLS head gasket, small cam and valve springs. ECU is an EL with XG harness with a J3 chip.

It will toast the tyres all day long, probably make 300 and something HP...not bothered really.


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Yeah I agree, spending $ on an engine to make atmo power then boosting on top of that is pretty much building the engine twice.

You don't need a mega-dollar top end in turbo applications, the whole idea is that you're force-feeding it for the extra torque (and power) rather than making the poor thing scream its tits off to achieve the same goal.

A turbo setup needs slightly upgraded valvesprings, wide lobe cam, good pistons, and especially a good ignition system, programmable and with decent output. Anything less will be a massive compromise.

Making big power on what most would describe as an agricultural engine like the Crossy takes specialist knowledge and lots more dollars than the usual V8 build. The Crossy has 2 disadvantages in that regard. It has less cubes, and is undersquare so rpm is not something it likes.

A turbo fixes the breathing once the atmo torque drops off. Dollar-for-dollar, turbo wins. Build the engine solely with that in mind and bolt on the snail when everything is good to go

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If you are planning to turbo, you are better off with stock or slightly longer than stock rods anyway. I would not use 200 rods, the benefit of the longer rods is for NA applications. There are pistons that exist for the AU rods that will work, but you will need to look. Just make sure the rod length + piston compression height add up to the same value as it does with the stock setup. If it is price that turned you off of the Spool rods, forget about 300hp NA + more later. If you have never driven a near stock crossflow and a decent sized turbo (say GT3582R) running 8-12 psi boost, you should try that first before committing to this build. 

i don't think you could have possibly finished reading those threads yet.

XPT means RECONDITIONED stock bottom end for FRESH.. 

i think you can go a long way with just ARP rod bolts but,  i'll ask what your budget is, because you won't get much change from $10,000 for that power level at a guess (reliably) 

i would suggest you read both of these threads.. then decide if the cost is justified? or in the budget.
there's a LOT of info, and heartache, and reality. 

My question would be.. why do you want 300hp NA if you are going to turbo it.. could probably turbo straight up for cheap and get 300hp relatively easy.
 
 
 
 
 

https://www.spoolimports.com/ford-250-xflow-with-200-rod-ross-racing-forged-piston
 
 
 
 
 
Ross aren't the best forgies available but would most likely do the job for you
 
 

Yeah it costs a lot to defy the laws of physics, but some get a kick out of it.... Good on them, the world would be boring if everything was LS

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And that's the great thing about a turbo

Make your mind up!! 300RWHP aspo will cost serious dollars and in no way will you then be able to take that engine and add boost. If you think you can - your dreaming. Pure and simple. 
 
If you want boost, build it for boost straight away.  I have many customers who run boost and run fast reliable times with near stock components.  They have a good combination of parts, good tune and it works. 
 
You need to make up your mind and stick to the plan or your in for a world of hurt. Both will cost dollars to do properly. Both will cost even more if you chop and change and try and make NA change to boost. 

Crossflows were built for boost.
 
 
 
 

Hey XPT
 
"Yep with a stock valvetrain, just a decent set of valve springs, decent head gasket & fresh bottom end. Stock CR is perfect for a turbo."
 
Will definitely do the above just wondering what you refering to with Fresh bottom end?
 
Cheers

Yep with a stock valvetrain, just a decent set of valve springs, decent head gasket & fresh bottom end. Stock CR is perfect for a turbo.