Busa rods and pistons into 1052-1200 Oil cooled

[slabbyfaceddean]

Hi everyone , while im waiting on a decent frame/chassis ive been busy beavering away on forced induction engine spec. I have a question about busa rods into the oil cooled 1052-1200 series engine. I know the pistons fit bring the spec to 1216 with  boost ready low compression. My question is will the rods fit too? And if they do what is known about the fitment ?

Cheers inadvance 

[no class]

1052 has a 58mm stroke 81 mm busa pistons will net you 1195 cc   1127/1157 59mm stroke will net you 1216cc .rod big ends are all the same size 1052 /1127/1157 . small ends all the same @ 20mm. rod lengths vary  (1052)117.4 (1127)117 (busa) 119.5  case boring will be required for the 1052 as well as a cylinder re-sleeve ( using the 1052 cylinder block )  1127 bored to 1216  leave a thin sleeve wall and imho not recomended . bandit 1200 bored to 1216 is the best bet . check your deck heights on your choices of rods / cylinder blocks / crankshaft stroke. do your calculations and find the right configuration for your build .

[slabbyfaceddean]

Thank you. Can i us Busa rods too to give me 1267 cc if my calculations are correct  

[Askamaskinservice]

Think again, Rod lenght doesn't increase volume, stroke and bore does.

With different lenght of rod you get different CR. Amongst other things.

[slabbyfaceddean]

Yeah thinking about it im being dense, they would just bring the CR back up. Good for a NA engine but not for a charged engine..

[no class]

yup..... just keep in mind that keeping the proper squish is important for both NA and forced induction .

[Gixer1460]

If you assume the slabby pistons will be close to deck ht. with std rods - then use of std. busa rods will poke them out by nearly +2mm so needing a block spacer!

[manden]

 Has anyone actually checked what the cr becomes with busa rod/Piston combo on an 58mm and 59mm crank shaft?

Edited August 21, 2019 by manden

[Gixer1460]

Can't actually be calculated as piston will be out of the block by a mm or 1.5mm if using a 1mm thick gasket! So subject to what thickness block spacer you use, any chamber volume and thus CR can be obtained!

[MeanBean49]

3 hours ago, manden said:

 Has anyone actually checked what the cr becomes with busa rod/Piston combo on an 58mm and 59mm crank shaft?

I worked it all out a while ago for 59mm crank and bamdit head/rods with busa pistons it was 7.8:1 and when using Gen 1 busa rods as well, with a 2mm spacer plate it was a little higher at 8:1 iirc

Edited August 22, 2019 by MeanBean49

[manden]

I'm not looking for open chamber. Just if someone had calculated what comp would be with busa rods and pistons for n/a. I would like to use r1 big bang pistons on busa rods but I'm not sure they will fit well.

[manden]

19 hours ago, MeanBean49 said:

I worked it all out a while ago for 59mm crank and bamdit head/rods with busa pistons it was 7.8:1 and when using Gen 1 busa rods as well, with a 2mm spacer plate it was a little higher at 8:1 iirc

Not what I was looking for, but thanks for chipping in m8

[Duckndive]

54 minutes ago, manden said:

Not what I was looking for, but thanks for chipping in m8

you cant get an answer with out all the info

there are plenty of on-line calculator's to do the sums for you

eg  https://www.rbracing-rsr.com/compstaticcalc.html 

 

Edited August 22, 2019 by Duckndive

[manden]

Should be 12.04:1 with the busa rod, R1 piston and 58mm crank.

And

13.18:1 with the busa rod/piston combo and an 58mm crank.Fast calculations made with 14cc chamber and a 1.8mm compressed gasket

 

[Gixer1460]

How are you getting a 14cc chamber? From memory a GSXR 1100 chamber is about 21 or 26cc. Thats a lot of metal to deck off with potential for valves to smack the shit out of the pistons? Thick gasket as well!

[manden]

decked 750 shims head. should have been in the info