Forged engine build - Importance of bottom end balance?
Discussion
I'm in the midst of building a new engine for my A3 (1.8t AGU bottom end), with rods, race bearings and all the other usual bits.
I know, among the rest of the guys on the VAG/1.8t scene, it's actually quite uncommon to have the bottom end balanced while embarking on a build like this. And, if I'm honest, I could do with out having to spend an extra 200 quid!
At the same time though, it makes sense that when spinning at 7k rpm, a few grams here and there is going to make a huge difference on the load to the bearings/crank.
Whats peoples thoughts and experiences on this? . . Any input welcome
Thanks in advance!
I know, among the rest of the guys on the VAG/1.8t scene, it's actually quite uncommon to have the bottom end balanced while embarking on a build like this. And, if I'm honest, I could do with out having to spend an extra 200 quid!
At the same time though, it makes sense that when spinning at 7k rpm, a few grams here and there is going to make a huge difference on the load to the bearings/crank.
Whats peoples thoughts and experiences on this? . . Any input welcome
Thanks in advance!
Because they're a well established engineering company and they've been doing this sort of stuff day in day out for years... They have all the best equipment and the engineers to do the job properly. If there's anyone that knows what they're doing, it's them... I'm not sure how I can be any more sure!?
I guess that's what your getting at though? . . But without getting an engineering degree and then some work experience in an engineering shop then I will never know "for sure" on that logic.......
I guess that's what your getting at though? . . But without getting an engineering degree and then some work experience in an engineering shop then I will never know "for sure" on that logic.......
No, it's the original crank and with an OE VAG fly wheel, but from another car (G60 single mass). They're going to check the crank/journals for condition/ovality etc.
I know my rods are balance to with in a gram already and I can make sure the pistons are the same (or at least match them best I can to the rods). That's what I was thinking though, perhaps just get the flywheel, crank and pulley balanced and do what I can to match the rods/pistons up.
I know my rods are balance to with in a gram already and I can make sure the pistons are the same (or at least match them best I can to the rods). That's what I was thinking though, perhaps just get the flywheel, crank and pulley balanced and do what I can to match the rods/pistons up.
Pretty much every possible opinion there... ha ha! The last one suites my budget, thats for sure ;-)
The other side of the coin is that the flywheel and clutch assembly are already in the car on the engine that is being replaced... I was kind of hoping to do the engine swap in one weekend but if I were to balance the clutch/fly/crank/pulley together then I'd have to rip the old engine out just to finish building the new one!
Not what I was planning on :-/
Pumaracing, have you got much engine building experience? . . As I said I know very few of the 1.8t boys bother with balancing on builds like this. And I'm starting to lean that way my self if I'm honest! Save me the time money and hassle, that's for sure!
The other side of the coin is that the flywheel and clutch assembly are already in the car on the engine that is being replaced... I was kind of hoping to do the engine swap in one weekend but if I were to balance the clutch/fly/crank/pulley together then I'd have to rip the old engine out just to finish building the new one!
Not what I was planning on :-/
Pumaracing, have you got much engine building experience? . . As I said I know very few of the 1.8t boys bother with balancing on builds like this. And I'm starting to lean that way my self if I'm honest! Save me the time money and hassle, that's for sure!
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