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CVO Technical => Twin Cam => Topic started by: GMR-PERFORMANCE on September 26, 2013, 12:32:58 PM
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We are still working towards the " best" kit money wise vs final output. This kit is using stock size valves, hand porting, and milling of the surface. With a .030 head gasket and a minor cut on the surface we can get the needed 10.5 compression ratio that we where looking for. Off the shelf SE 58 t/b SE clutch spring, the pwr dual head pipe and good slip on mufflers. This is would be middle of the road performance wise from bolt in to major porting. The clutch was holding pretty good . However I think that use of a slightly heavier spring such as the barnett for one brand would be a better item. Slight slipping. The tq curve may come up a small amount .
(http://i1290.photobucket.com/albums/b537/Gmr-Performance/2012CVO110GENESIS577SE58GMRHEADSPWRDUALSSTD_zpsce9bfe83.jpg) (http://s1290.photobucket.com/user/Gmr-Performance/media/2012CVO110GENESIS577SE58GMRHEADSPWRDUALSSTD_zpsce9bfe83.jpg.html)
(http://i1290.photobucket.com/albums/b537/Gmr-Performance/2012CVO110GENESIS577SE58GMRHEADSPWRDUALSSAE_zpse9454a71.jpg) (http://s1290.photobucket.com/user/Gmr-Performance/media/2012CVO110GENESIS577SE58GMRHEADSPWRDUALSSAE_zpse9454a71.jpg.html)
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Nice curves for a relatively economical build. Stock injectors or did you upgrades to 5.3's to go with the 58mm TB? Any upgrades to valve guides or springs? Where would you estimate the performance would be with a 2:1 exhaust like a Fatcat?
Any thoughts on whether this performance could be improved more on a water-cooled 2014? Could you push the timing further with water-cooling?
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Funny you ask about pushing it further. This is right 10.49 compression and I have run this cam with the HD stage III kit which is higher than this kit.
This kit is stock injectors ( they where not even close to 80%) stock valve springs so really what my goal is to have a complete kit with map on the ex systems that we have tested for under 1675 complete minus EX air cleaner and tuner. The rest we supply , T/B head work gaskets cam bearings, push rods and covers. so the AVG guy can bolt this kit on and go. Options would include a flat top piston bore and hone + 10 piston if the current engine has excessive clearance or been over heated. Upgrades could also be new guides and valves again for the same reasons.
On the 2-1 pipe I have seen pretty much the same power numbers. The Twin cooled test bike at this point will take on more compression and run as cooler or at least be more temp stable.. At this point I am not having any issue with having to pull timing to show the power any further advance is not resulting in more power.