parsa1
2nd Class Ticket
Posts: 25 
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Post by parsa1 on Apr 7, 2015 12:17:22 GMT
Hi all does anyone know if the gs piston on the sip website for dr177 and polini 177 fits the dr180 kit?
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Post by henri on Apr 7, 2015 13:03:28 GMT
not for sure but i'd guess no, the difference between dr177 n 180 might be in the head , you'd need to carefully check the measurements given for bore size/ring thickness/piston size , an maybe even message there tech site , h
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Post by vespasco on Apr 7, 2015 18:37:44 GMT
Id imagine it would be a 63mm bore, most 180 (or 177 to be precise) kits are 63mm
But yeh, do check first
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Post by rab on Apr 7, 2015 20:19:40 GMT
Buy rings for a Dr 180 then you know there right why would you buy them for a 177 if you have a 180
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Post by sime66 on Apr 8, 2015 6:21:11 GMT
DR177 = DR180:
Pi(63mm/2)²x57mm = 177682.98mm³
= 177.68cc
= “DR180”
= “DR177”
This does not answer the original question, but might clear up the 177 – 180 confusion. The piston you refer to does seem to be intended for a DR177; it’s Ø63 with two oversizes, and looks like it's intended for improved durability, though how it would perform, uncut, without all the little DR piston ports is something to leave to the clever blokes by the looks of it.
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Post by henri on Apr 8, 2015 7:55:13 GMT
so the diff is probably in head profile if bores the same , but as rab says if ya can find the dr180 rings i'd go for them rather than chance a dr177 set , try "motortime2012" on e bay ,theve been doing deals cheapest on dr kits n piston/ring kits recently . H
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Post by sime66 on Apr 8, 2015 8:01:52 GMT
I think you'll find that a DR177 is a DR180; they're not two different kits; just two different names for the same kit. - Ø63, 177.68cc; nominally a DR180, actually a 177cc.
That piston is intended for this kit, which I think was the question, but whether it's a good option or not needs investigation.
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parsa1
2nd Class Ticket
Posts: 25
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Post by parsa1 on Apr 8, 2015 10:45:24 GMT
Hi sime66 that was the question has anyone ued this as an upgrade to there dr180 kit
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Post by sime66 on Apr 8, 2015 11:14:40 GMT
Not me, but the point I was making (other than the DR177/180 red-herring) was that it looks to me from first reading, that the piston itself needs a bit of a tweak for performance; look at the bits I've highlighted in red:  It looks like a durability upgrade, but not a straight swap to me - there's loads of ports missing; "ideal for do-it-yourself tuning", it says. |
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