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rod interchangibilty

2K views 21 replies 4 participants last post by  gustavm 
#1 ·
Can anyone tell me if 1.5 rods will fit a 1.7 8v,without pulling my 1.5 engine apart it would be great to know if they are the same part.
 
#4 ·
Oh !
I'm pretty sure that they are totally different !
The thickness on the back end of the rods is different and so they wont go into the heads unless you modify them.
I cant remember if the 1.5 are thicker or thinner than the 1.7, I just know there is a difference.
I suspect the angle's would be different as well
 
#15 ·
If the 1.5 and 1.7 conrods are the same, i guess the 1.5 piston would hit
the cylinder head because of the longer stroke of the crankshaft.
I think the pistons should be replaced to the 1.6 boxer ones (same diameter,
but the piston pin vertical position is different).

If you think i can give you the 1.6 boxer piston sizes, and you can compare
them with your 1.5 piston(s).
 
#16 ·
I suppose you could always do a check and see if its ok before closing up the engine ? If you already have the parts mentioned above, just fit the 1.5 crankshaft on the 1.7 block and take a 1.5 conrod, fit a 1.7 piston on it without piston rings or anything, and measure the top end to calculate the valve clearance !

You can do the same with a 1.7 conrod and a 1.7 piston and compare ! Then you can educate us as well :p
 
#21 ·
I'm probably a bit stubborn as I'm still not convinced to abandon this project. I'm not giving up supercharging yet ! I've got a few spare pistons to kill so I'll give it a shot and see how it goes :lol:

Tasos had his 1.7 8v engine supercharged for over 4 years and nothing like that happened to it ! He was running lean as well ! I will have a Dastek piggy back ECU parallel to the one of the chipped 16V ECU as well to manage fuel and ignition. Hopefully this will do the trick ;) If not, a fifth injector is also in the plans. A mixture gauge will be a must in this situation. Much more meaningful than any other gauge.
 
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