Will this work?

[MRJLB84D]

Ok, this MAY get confusing so i will try and explain the idea as well as i can...

My Xflow is an 86DA block, now, im sure we have all heard the fact (or fiction) that EF OHC cranks bolt straight into the 86DA's, True of faulse? (im sure this has been covered before)

Now, Move to the OHC e series family, and have heard of people turbo'ing and using BA rods and pistons.

So my theory is, 86DA block, + (possibly) EF crank + BA rods and pistons = a working combo??

Other info i need is, are the 200ci rods 6in in length? cause i have been told today the BA rods are 6in long too, so if i keep the Xflow crank, the ba rods and pistons might just fit then?

 

[xctasy]

Nope.

The BA pistons are 48 thou too small a diameter (3.632 stock vs 3.680 stock), and are way lower than EA or XF pistons (AU-BF 1.163 vs EA-EL 1.385", and XT to XF 1.531")

98-07 AU/BA/BF Rods are 6.06" tall

EA to BF blocks are 9.22" tall, while X flow blocks are 9.38" tall.

Soooo, when an EF crank and BA rods are put in an XF block, you get 48 thou of piston slop, and the piston parking 202 thou (0.202") down the bore. Any thing more than about 40 thou short of the block is a liabilty, 202 is way too much.

There are 60 thou over BA pistons and EA to EL pistons are exactly the right height for an XF block /EF crank/BA rod copmbo, but you can't get EA-EL pistons in XF diameter. Stock, they come in 3.612", and the biggest over size is 3.672".

 

[rammed wx]

we thought about doing this too

you could always sleeve the block to suit the pistons.

 

[xctasy]

Sleaving is a great idea only if your in America and trying to preserve a numbers match I6 cylinder block...

As A7M has said, why do it when there are OHC's around? The valve gear, block and general reliability of the OHC is good, and they fit into any square body Falcon from 1967 on wards. The expertise is there, and they can go to 6000 rpm without worries with the right parts, while still having better torque than a stock 5.0 litre V8. I'd put it this way. Comparing an X-flow to an AU SOHC orBA twincam is like comparing a Kent engined Escort 1600 to Escort BDA. When the cost of a BA engine is so cheap, the electronics, sump and engine mounts are nothing.


The only way to make the better OHC parts fit together on an X-lfow is to get 6.275" 3.3 or 3.2 EA rods and sleave the block. The 3.3 rods are not as strong as AU/BA/BF rods, and your X-flow won't become an OHC anhilator.


To clarify, the only reason I like X-flows is because they are much simpler than the OHC engines, and they don't have invasive and expensive electronics or ADR emissions issues, and I don't have to be pulling 5000 rpm plus ever. An X-flow is a tractor engine which carries too much compression, tends to detonate and has a way too mild cam, and a poor selection of gearboxes and induction systems to make it perform.

At Broadmedows, the 250 crank, rods and pistons have been distruction tested to 7500 rpm. The X-flow is a good engine to modify in a mild sense....when you are making the torque work for you. Because of the rod and stroke ratio, and valve gear it is hard to make them rev above 4800 rpm.

The later 1981 on port size and valve gear are a bit of a disaster. They are much like comparing a stock 302 Cleveland 2V ...the stock engine is unable to be taken out and trashed at 6150 rpm on an empty road like 351 Phase 3 , so why do anything to raise the rev range?. Rods, crank and pistons are premium modifiactions for a hard out X-flow.

 

[MRJLB84D]

Ive been in contact with the boys at www.atomicperformanceproducts.com.au

They say their H beam rods wil go onto the 250 crank and being a 6.060in rod and the use of their custom piston to suit an xflow with any compression ration, dish size etc i want.

I am sticking to the xflow because of a number of reasons, plus with the right prepping can make just as much power as any turbo's OHC or BA motor i have seen with them making slightly better torque than the later engines too but will admit that yes i would like to go a OHC or BA motor but the $$$ just aint there to build a super strong one for boost.

 

[64xm]

have you got a price on that stuff from atomic?

 

[MRJLB84D]

yeh i do, here is a copy of the email i received from them:

Hi Dave,
We have rebuilt Ford (both X/flow and non X/Flow) engines for high HP
applications by using our #306200 or #306201 conrod and a custom piston. As
you know, most Ford 6's share many similarities such as journal size etc and
by using our conrod with a 6.060" centre to centre length and a custom
piston it provides a more desirable rod to stroke ratio.

Costs are as follows:
#306200 conrods are rated to 600Kw and are $1360.00
#306201 conrods are rated to 1050Kw and are $1890.00 set.
#306260 Custom forged pistons are $1550.00 set - any compression ratio, any
dish or dome volume, etc

Hope this helps - if you have any further questions please don't hesitate to
call/email.

Cheers, Brad
Atomic Sales

Still a few bucks i know but.... since when is HP cheap?