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Barra pistons & rods into EL block 

 

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 Post subject: Barra pistons & rods into EL block
Posted: Sat Mar 20, 2010 6:38 pm 
Tyre Shredder
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I am going to turbo my engine in the near future. My engine is the EL distributor engine.
I like to know if the Barra forged pistons & Barra H beam rods will fit into my engine.
I know machining will be required on my crank.
What i'm thinking of doing is using the ACL 6MKRY9710 forged barra pistons & a set of H beam barra length rods. I still would like to use my crank & block.
I also would like to know about a main stud girdle if the above is possible.
Any info about this combo will be greatly appreciated.

 

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 Post subject: Re: Barra pistons & rods into EL block
Posted: Sat Mar 20, 2010 7:07 pm 
Getting Side Ways
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Yep....I'm using Barra LPG pistons, and AUII rods, on an EL crank and block.
But the girdle (AU) will fit with a little modding to the sump. You need the AU main cap bolts, coz they are longer.

 

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 Post subject: Re: Barra pistons & rods into EL block
Posted: Sat Mar 20, 2010 7:59 pm 
Tyre Shredder
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Are the AU11 rods the same length as the barra ones ?

 

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 Post subject: Re: Barra pistons & rods into EL block
Posted: Sat Mar 20, 2010 9:25 pm 
Getting Side Ways
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all AU rods are 6.060 same as BA - FG rods.
Your crank will not need special machining to make them fit, the big ends are an exact fit. The only trouble you'll have is the the Barra pistons don't have a valve relief to suit the 2valve heads.

It would also be far easier for you to just order a piston/rod package from Spool or Atomic.

 

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 Post subject: Re: Barra pistons & rods into EL block
Posted: Sun Mar 21, 2010 12:01 am 
Getting Side Ways
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So you could fit sayyyy F6 rods and XR6T pistons with valve relief cut in a EL block using the existing crank and have a fair decent bottom end for cheap?

 

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 Post subject: Re: Barra pistons & rods into EL block
Posted: Sun Mar 21, 2010 1:35 am 
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tickford_6 is totally right and spend the extra dosh as it isent much to go decent gear

 

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 Post subject: Re: Barra pistons & rods into EL block
Posted: Sun Mar 21, 2010 6:13 pm 
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needfordspeed wrote:
So you could fit sayyyy F6 rods and XR6T pistons with valve relief cut in a EL block using the existing crank and have a fair decent bottom end for cheap?



For the cash you'd spend on new F6 rods and forged pistons, you'd be better of having custom pistons made to suit the EL rods, they are stronger anyway. OR wait a few months until SPOOL release the EL forged pistons that they have in the works. The only reason people are using the BA rods in early engines is because there are a number of pistons to choose from that fit. If good forged pistons were easy to get for the EL engine most people would bother changing rods.

If you really want a strong bottom end, buy a piston and rod package from Atomic or Spool.

 

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 Post subject: Re: Barra pistons & rods into EL block
Posted: Sun Mar 21, 2010 6:42 pm 
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XR6T rods have a smaller gudgeon pin size than the non-turbo pistons.

 

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 Post subject: Re: Barra pistons & rods into EL block
Posted: Sun Mar 21, 2010 10:09 pm 
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I would rather go for a steel H beam rod. The longer rod that the AU-FG have got give a better rod ratio than the smaller EF-EL rods. Longer rods has less stress on the crank & bores.
Thanks for all your input guys it has been a huge help in my decision. :D
I am going to go for a Atom or Spool steel rod (AU-BF) & a forged piston to suit turbo application.
I did see a main girdle in Atoms website to suit EF-EL blocks (10mm).
I will also go for a High Energy super pan.
All this is bringing back memories when i built my XW circuit racer with 600hp's on an engine dyno running avgas. :D

 

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 Post subject: Re: Barra pistons & rods into EL block
Posted: Sun Mar 21, 2010 10:53 pm 
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4.5mm in rod length, from 1.504 to 1.55 rod ratio wont make that much difference

 

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 Post subject: Re: Barra pistons & rods into EL block
Posted: Sun Mar 21, 2010 11:32 pm 
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I think u should start with an AU engine and get all bits to suit as AU engine are better than previous

 

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 Post subject: Re: Barra pistons & rods into EL block
Posted: Sun Mar 21, 2010 11:50 pm 
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Are you for real tickford_6.
4.5mm is a massive differance & will make a massive differance in the rod ratio.
I have built & know alot about combo,s for cleveland engines.
One example: std cleveland rod length 5.778" high performance people put 6" chev rods to improve rod ratio & a smaller 2.1" big end (Chev size) for less rpm on the big end.
A 0.222" differance in length. You do your maths less than a 1mm.
Just to add a longer rod will stay at TDC & BDC longer which means more cylinder pressure & better burn. I had 6" steel Childs & Abbot rods in my cleveland.
What i've learnt is when it comes to engine & cylinder clearances a hair clearance will make a differance.

 

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 Post subject: Re: Barra pistons & rods into EL block
Posted: Sun Mar 21, 2010 11:59 pm 
Tyre Shredder
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I also forgot to say longer rod less piston speed.

 

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 Post subject: Re: Barra pistons & rods into EL block
Posted: Mon Mar 22, 2010 12:30 am 
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racer wrote:
Are you for real tickford_6.
4.5mm is a massive differance & will make a massive differance in the rod ratio.
I have built & know alot about combo,s for cleveland engines.
One example: std cleveland rod length 5.778" high performance people put 6" chev rods to improve rod ratio & a smaller 2.1" big end (Chev size) for less rpm on the big end.
A 0.222" differance in length. You do your maths less than a 1mm.
Just to add a longer rod will stay at TDC & BDC longer which means more cylinder pressure & better burn. I had 6" steel Childs & Abbot rods in my cleveland.
What i've learnt is when it comes to engine & cylinder clearances a hair clearance will make a differance.


I don't disagree with your theory (except for the extent), but 0.222" is around 5.6mm.

If you're buying the gear new though I don't see why you wouldn't go for a longer rod where possible.

 

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 Post subject: Re: Barra pistons & rods into EL block
Posted: Mon Mar 22, 2010 9:10 am 
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Just FYI, but did you all know that Scat make a conrod for the Barra? 4340 H-Beam rod, 6.059" long, suits 0.867" pin. Retail for approx $700 a set. Very good quality rods, and very well priced, when compared to spool rods.

PM me if anyone is SERIOUS about wanting this stuff, I may be able to do a bit better price for FM members.....

 

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