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xr8boy
Fordmods Stock as a Rock
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 Posted: Thu May 08, 2008 8:05 pm Post subject: |
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as far as i know the r302 block has been discontinued in favour of the new motorsport boss 302 block.
aren't the v8 supercar cranks designed to run a rod length of 5.4in to 5.6in in a 347ci capacity. what rod length are you thinking of running |
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Scaffy
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| Posted: Thu May 08, 2008 9:35 pm Post subject: |
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| Aren't the V8 supercars 5.0L capcity still? |
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XR9UTE
EFI Guru
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| Posted: Fri May 09, 2008 10:22 am Post subject: |
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| Scaffy wrote: | | Aren't the V8 supercars 5.0L capcity still? |
Yes. Richie is probably going to use a large bore for 331 though? |
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Scaffy
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| Posted: Fri May 09, 2008 3:16 pm Post subject: |
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| Sorry, I misread the post above me. I thought xr8boy was saying that they were using 347ci. |
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xr8boy
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| Posted: Fri May 09, 2008 5:29 pm Post subject: |
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they are still under 5.0L's but run a long rod
thats why they run such a small (honda) journal, to get the long rod in there |
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EBXR8380
Fordmods - Getting Side Ways
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| Posted: Fri May 09, 2008 9:52 pm Post subject: |
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| xr8boy wrote: | they are still under 5.0L's but run a long rod
that's why they run such a small (Honda) journal, to get the long rod in there |
I doubt that they use Honda size in this case??
Rod sizes up to 5.4 inch long can be used ..The pin height in piston is different to accept rod length..
TMK the cranks have to be a certain weight ???
Remember Holden getting a please explain about lightweight cranks..
The new Boss 302 block doesn't accept strokers very well... |
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Macca
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| Posted: Fri May 09, 2008 9:59 pm Post subject: |
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| EBXR8380 wrote: | | xr8boy wrote: | they are still under 5.0L's but run a long rod
that's why they run such a small (Honda) journal, to get the long rod in there |
I doubt that they use Honda size in this case??
Rod sizes up to 5.4 inch long can be used ..The pin height in piston is different to accept rod length..
TMK the cranks have to be a certain weight ???
Remember Holden getting a please explain about lightweight cranks..
The new Boss 302 block doesn't accept strokers very well... |
I have no idea about V8 supercar rod length but achieving longer rods via smaller big end journals can work and in some ways safer than pushing the pin higher into the piston. |
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EBXR8380
Fordmods - Getting Side Ways
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| Posted: Sat May 10, 2008 11:34 am Post subject: |
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Yes its NOT a question of strength when it comes to V8 supercars.. Its a question of performance with what they can do around the rules.. It wouldn't surprise me if they used a different combination to say Bathurst to Hamilton , qualifying.. There is less side loading the further the rod is in piston.. The longer rod can give more torque due to piston is at tdc longer.. Esp usefull with pump type fuels..
But as they say.. With every action there is an equal to opposite reaction...
330 strokers generally rev very hard, the gudgeon pin just mises the oil control ring with 5.4 rod.. Pistons are custom anyway.. |
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richie
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| Posted: Mon May 12, 2008 12:01 pm Post subject: |
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Thought we had a chance of a R302 block quietly but so far to no avail. Would be good as these are lightened. Probably go with Dart Sportsman 8.2" deck.
The calculations are being toyed with as we speak.
Bore wil be around 4.16". Rod size to be determined but over 5.6"
Journal size from memory is around 1.569" or such like.
Didnt weigh the crank but you can do dumbell lifts with one hand.
Once calcs are done I will post up specs & pics - if I am allowed!
Gear box likely to be 4L80E but I think the electronics in these play up at higher power end. Cost is $5100 which includes the controller. I understand these are also available without electronics which may be the way to go. Although I know of a Monaro here pumping 750 fwhp through the electronic box.
Richie. |
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MICKYYYY
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| Posted: Wed May 21, 2008 1:16 am Post subject: xr8 |
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| Any news on this project???? |
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richie
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| Posted: Wed May 21, 2008 11:19 am Post subject: |
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Just getting ready to tune the 5.0L on engine dyno with M800.
Once this engine is up & going will start on 331.
Re the 331 - Bit of messing around because there are enough bits (apart from 2 blocks) to build 3 with varying specs - it's like seagulls fighting over scraps!
Will restart thread when we get going on machining.
Richie. |
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richie
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| Posted: Wed May 21, 2008 11:38 am Post subject: |
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Just tuning the mild 5.0 on the engine dyno - should be finished next week.
Will start on 331. Have enough bits to build 3 ( apart from 2 blocks ). Its like seagulls at the tip picking over the bits.
Mine bits are more or less settled - just need to sort calcs for cam etc. so can drive on the street.
Richie. |
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