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BA Pistons in a EF 4.0L 

 

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 Post subject: BA Pistons in a EF 4.0L
Posted: Tue Feb 10, 2009 10:18 pm 
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Hi just would like to know if the BA/BF XR6T or Typhoon pistons will fit in my EF motor????? and if any one knows if the conrods will fit just bolt in??? if not can any one tell me were I can get some forged pistons for my EF and how much???
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 Post subject: Re: BA Pistons in a EF 4.0L
Posted: Tue Feb 10, 2009 11:00 pm 
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barra pistons will fit the SOHC block if you use barra rods. the pistons will need valve reliefs cut to suit the SOHC valve position.



NOW, TO FIND THAT BRICK WALL AND BEAT MY HEAD ON IT

 

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 Post subject: Re: BA Pistons in a EF 4.0L
Posted: Wed Feb 11, 2009 6:24 pm 
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charlie4401 wrote:
Hi just would like to know if the BA/BF XR6T or Typhoon pistons will fit in my EF motor????? and if any one knows if the conrods will fit just bolt in??? if not can any one tell me were I can get some forged pistons for my EF and how much???



You want the bad news?????? Forged pistons for a ef don't exist change to a BA length rod, they are a bit longer, and get valve reliefs machined. I have just ordered the new forgies fo my car, they cost me $2100 from the states they are custom made because i want a forged 10.5/1 piston, they have heaps of s**t changed on them. Deeper valve reliefs, exhaust valve relief, thicker crowns, bigger and more oil drain holes, lowerd compression ring slots, ring slots to fit nitrous rings, closer compression ring slots, more skirt dia and skirt length below the pin, changed pin height and gudgen pin style, heat coated tops and friction coated skirts! definataly worth the money. Wont need to replace them in a hurry

 

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 Post subject: Re: BA Pistons in a EF 4.0L
Posted: Wed Feb 11, 2009 8:09 pm 
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Pics of an EF piston and a BA LPG piston ( 10.7:1) sharing the same gudgeon size. Note crown height difference. You will need the later conrods ( AU onwards).

 

 

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EF & BA pistons 001_resize.jpg
EF & BA pistons 001_resize.jpg [ 108.6 KiB | Viewed 89 times ]

 

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 Post subject: Re: BA Pistons in a EF 4.0L
Posted: Wed Feb 11, 2009 8:25 pm 
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bugger so it dose not look like a good idea so far. Dose any one know how much boost the standed bottom end can take?????????
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 Post subject: Re: BA Pistons in a EF 4.0L
Posted: Sun Mar 15, 2009 12:16 am 
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So with a BA LPG piston you will need to use an AU rod in a EF/EL engine???

How about a BA LPG piston in a AU engine???

 

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 Post subject: Re: BA Pistons in a EF 4.0L
Posted: Sun Mar 15, 2009 8:46 am 
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MICKYYYY wrote:
So with a BA LPG piston you will need to use an AU rod in a EF/EL engine???

How about a BA LPG piston in a AU engine???



WHY?

unless you're building a turbo engine in which case you'll probably be buying rods to go with them.

using BA pistons you would use a BA rod. but in an EF the BA rod is a step backwards anyway.

 

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 Post subject: Re: BA Pistons in a EF 4.0L
Posted: Sun Mar 15, 2009 9:38 am 
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So if you use a BA piston in a EF/EL engine then u have to use rod???

How about AU engine???

 

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 Post subject: Re: BA Pistons in a EF 4.0L
Posted: Sun Mar 15, 2009 10:39 am 
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it comes to gudgeon pin size.

the question still begs though. WHY?

 

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 Post subject: Re: BA Pistons in a EF 4.0L
Posted: Sun Mar 15, 2009 11:51 am 
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Well im tossing up to get myself an AU engine and doing a full reco/rebuild when my engines headgasket lets go and do an AU engine conversion.

Also need to find out what compression the AU EGAS engines are at as well as i may end up with a high comp engine using EGAS pistons.

This information is also for my mate as he wants to do a engine conversion to his TE cortina and this would be sweet conversion as it dosent cost an arm and a leg to do it.

 

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 Post subject: Re: BA Pistons in a EF 4.0L
Posted: Tue May 05, 2009 1:12 pm 
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Been a while but any response to my question if anyone can answer plz

 

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 Post subject: Re: BA Pistons in a EF 4.0L
Posted: Tue May 05, 2009 5:41 pm 
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Yes you will need to use ba rods still they are different to AU ones as well.

 

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 Post subject: Re: BA Pistons in a EF 4.0L
Posted: Tue May 05, 2009 5:54 pm 
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I am using BA LPG pistons, AUII conrods, in an EL crank & block.
I have machined valve reliefs into the crowns of the ( BA LPG ) pistons.
The only thing left to do now is to machine a chamfer on the edges of the cuts.

 

 

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IMGP1393_resize.JPG [ 313.57 KiB | Viewed 79 times ]
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IMGP1394_resize.JPG [ 277.08 KiB | Viewed 92 times ]

 

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 Post subject: Re: BA Pistons in a EF 4.0L
Posted: Tue May 05, 2009 6:37 pm 
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by machining the valve relief do you lose compression there as well???

 

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 Post subject: Re: BA Pistons in a EF 4.0L
Posted: Tue May 05, 2009 6:41 pm 
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MICKYYYY wrote:
by machining the valve relief do you lose compression there as well???



They are 10.7 : 1 comp ratio in a BA, I don't know what that will be in an EF/EL block & head.
I bought a new AUII conrod so I can bore the small end to let the gudgeon pin slide in so I can check my clearences. The pistons have slight domes, not a dish, so straight up there is some advantage.

 

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