i saw a set of 1275 GT con rods on the old ebay and said would fit any 1275 apart from a cooper s crank. whats are the differences and how many types of conrods are there?
Con Rods And Cranks
Started by
dennismini93
, Dec 08 2012 09:40 PM
6 replies to this topic
#1
dennismini93
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Posted 08 December 2012 - 09:40 PM
#2
Artful Dodger
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Posted 08 December 2012 - 09:46 PM
the cooper S rods and cranks had thinner big ends. the big ends were made thicker due to the inferior metal used in the std 1275 crank and rods.
for the std 1275 engine there was (in order of best to worst in std form. lightness, balence, strength etc) the 1275GT rod, the A+ rod and the innocenti 1275 rod. dont use a 1275GT rod in a good, high HP engine unless highly modded. but then you may as well start with the A+ rods.
for the std 1275 engine there was (in order of best to worst in std form. lightness, balence, strength etc) the 1275GT rod, the A+ rod and the innocenti 1275 rod. dont use a 1275GT rod in a good, high HP engine unless highly modded. but then you may as well start with the A+ rods.
#3
dennismini93
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Posted 08 December 2012 - 09:51 PM
dont use a 1275GT rod in a good, high HP engine unless highly modded.
ok thank you, and why not use gt rods in high power engines?
#4
Artful Dodger
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Posted 08 December 2012 - 09:57 PM
they have huge weights built on to them to build in smoother running due to the intertia making the engine turn smoother. like having a heavier flywheel. they also have small additions either side of the little ends. pointless for a road sport / race engine! also, when they are modified they need shot peening or some form of hardening due to removing the exterior tension.
using A+ rods they dont have this, and are and have been used in quick engines with no modifications with some sucess. they fetch oretty much the same price, the 1275GT rods are probably dearer due to the 1275GT part!!!!
using A+ rods they dont have this, and are and have been used in quick engines with no modifications with some sucess. they fetch oretty much the same price, the 1275GT rods are probably dearer due to the 1275GT part!!!!
#5
Cooperman
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Posted 08 December 2012 - 11:34 PM
The Cooper 'S' rods are for a 1.625" big end crank journal. All the other 1275 engines have a 1.75" big-end journal.
The 1275GT rods are very poor for higher performance engines (this also applies to the Austin, Morris and MG 1300 rods).
The A+ or the Innocenti Mini-Cooper 1300 rods are excellent.
The 1275GT rods can be machined and re-balanced by someone who knows what he is doing, but it's an expensive thing to do.
The 1275GT rods are very poor for higher performance engines (this also applies to the Austin, Morris and MG 1300 rods).
The A+ or the Innocenti Mini-Cooper 1300 rods are excellent.
The 1275GT rods can be machined and re-balanced by someone who knows what he is doing, but it's an expensive thing to do.
#6
dennismini93
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Posted 09 December 2012 - 01:38 PM
do you think £40 + £9p&p is a good price for A+ con rods and pistons
#7
Artful Dodger
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Posted 09 December 2012 - 01:52 PM
If they are a set, are in good condition and the big end caps are correct for te rods then yees:)
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