9 1/2 Engine rebuild
Posted: 15 Mar 2018 19:50
Dear fellow Morinists
I am a new member and proud 9,5 owner. Bike is -07 version and i bought it as a project. It has a serious blow by issue as it did throw air box full of oil. Reason for this is not all clear.
Cause of this, engine is now disassembled and my plan is to write short story of project as i sure will have some question and someone else might find this usefull aswell. Will also make it short, as my English and writing skills does not allow me to be more poetic.
Primary goal with rebuild is reliability. Second goal is to get much better fuel efficiency. Third goal is to keep heat out of cooling system of engine and make power of it or lead it out thru exhaust. Fourth goal is to make bike even more fun to drive.
Taking engine apart was not very complicated and you can do it without expensive tools. Only three of them are needed
1)M38x1,5 puller https://www.motionpro.com/product/08-0306
2)Puller for cylinders can be modified of a cheap puller
3)Piston pins was very tight so these 'tools' was needed.
(see pictures below)
Inspection
1) Rear piston oil ring is broken.
2) One rear cylinder exhausta valve was not seated properly as there was lot of burnt oil debris on seating surface. Propably cause of excessive blow by.
3) One front cylinder exhaust valve guide was badly worn out. Valve did 3mm sideways and it surely created some exhaust blow by. All other did some 0,5mm.
4) Piston pins have some coloured marks on them.
Conclusion and assumptions
1) Piston rings are very delicate and i might have harmed one while disassembling.
It is better to have some linen around them immediately after cylinders are removed.
2) Valve guides are originally of iron and can easily be fitted with k-liners. If this is not possible, like in my case, then Renault guides are perfect. They need some work on lathe to put minor grooves on them for similar stoppers as orginals. My mechanic also suggested not to cut them short but leave as is, cause of originals are very short.
3) Valve stems are exceptionally long, which makes valves prone to shake and to retain heat.
Couse of curiosity.
1) Heads will be slightly ported and shaved for straightness and hopefully for more compression
2) Proper valve job with radius cut seats and 30 degree back cut for valves
3) Special coatings will be used on valves, valve stems, pistons, combustion chambers, exhaust channels and headers http://www.camcoat.com/main/coatings12.html
4) Tech line coatings (TLML) on cams and maybe even on cups, as this makes valve train life
easier. Choises are professionally TLML or DFL-1 coating https://www.youtube.com/watch?v=8ZoZjUn9szs Maybe this is more acute on Corsaros though... https://martelius.com/en/ceramic-coatings/
5)DLC coating for piston pins
? Fine tune for cam timing, if i find offset-keys that fit.
6) ? In case original ECU is not possible to remap properly, then Power commander V for Guzzi might do with MoMo ECU https://www.ebay.co.uk/itm/Dynojet-2009 ... 0033.m2042
7) Brisk spark plugs https://www.briskracing.com/buy-spark-p ... lug-detail
8) Final touch with RVS https://www.rvs.fi/en/
9) Dyno tuning for economy and driveability.
These are my first impressions and initial idea of how to proceed with the engine. Your comments and further questions are highly appreciated.
And if you have some parts over for this engine, please let me know
Will be continued...
VesaII
I am a new member and proud 9,5 owner. Bike is -07 version and i bought it as a project. It has a serious blow by issue as it did throw air box full of oil. Reason for this is not all clear.
Cause of this, engine is now disassembled and my plan is to write short story of project as i sure will have some question and someone else might find this usefull aswell. Will also make it short, as my English and writing skills does not allow me to be more poetic.
Primary goal with rebuild is reliability. Second goal is to get much better fuel efficiency. Third goal is to keep heat out of cooling system of engine and make power of it or lead it out thru exhaust. Fourth goal is to make bike even more fun to drive.
Taking engine apart was not very complicated and you can do it without expensive tools. Only three of them are needed
1)M38x1,5 puller https://www.motionpro.com/product/08-0306
2)Puller for cylinders can be modified of a cheap puller
3)Piston pins was very tight so these 'tools' was needed.
(see pictures below)
Inspection
1) Rear piston oil ring is broken.
2) One rear cylinder exhausta valve was not seated properly as there was lot of burnt oil debris on seating surface. Propably cause of excessive blow by.
3) One front cylinder exhaust valve guide was badly worn out. Valve did 3mm sideways and it surely created some exhaust blow by. All other did some 0,5mm.
4) Piston pins have some coloured marks on them.
Conclusion and assumptions
1) Piston rings are very delicate and i might have harmed one while disassembling.
It is better to have some linen around them immediately after cylinders are removed.
2) Valve guides are originally of iron and can easily be fitted with k-liners. If this is not possible, like in my case, then Renault guides are perfect. They need some work on lathe to put minor grooves on them for similar stoppers as orginals. My mechanic also suggested not to cut them short but leave as is, cause of originals are very short.
3) Valve stems are exceptionally long, which makes valves prone to shake and to retain heat.
Couse of curiosity.
1) Heads will be slightly ported and shaved for straightness and hopefully for more compression
2) Proper valve job with radius cut seats and 30 degree back cut for valves
3) Special coatings will be used on valves, valve stems, pistons, combustion chambers, exhaust channels and headers http://www.camcoat.com/main/coatings12.html
4) Tech line coatings (TLML) on cams and maybe even on cups, as this makes valve train life
easier. Choises are professionally TLML or DFL-1 coating https://www.youtube.com/watch?v=8ZoZjUn9szs Maybe this is more acute on Corsaros though... https://martelius.com/en/ceramic-coatings/
5)DLC coating for piston pins
? Fine tune for cam timing, if i find offset-keys that fit.
6) ? In case original ECU is not possible to remap properly, then Power commander V for Guzzi might do with MoMo ECU https://www.ebay.co.uk/itm/Dynojet-2009 ... 0033.m2042
7) Brisk spark plugs https://www.briskracing.com/buy-spark-p ... lug-detail
8) Final touch with RVS https://www.rvs.fi/en/
9) Dyno tuning for economy and driveability.
These are my first impressions and initial idea of how to proceed with the engine. Your comments and further questions are highly appreciated.
And if you have some parts over for this engine, please let me know
Will be continued...
VesaII