Kristjan Posted August 29, 2015 Share Posted August 29, 2015 Been thinking about tampering with my cams lately, would be easy to do as I'm planning to do valve clearances soon. I have standard 1995 WS cams in my 1146 right now, but seems like early exhaust cam had ~0,4 mm more lift. Obviously, both exhaust cams are longer duration than intake. Can it be a good idea to run another intake cam on exhaust side? That would be ~0,1 mm more lift than early exhaust cam, but ~0,5 mm more than late exhaust cam, numbers based on service manual. Would it be worth the hassle of setting them up? Some advice or thinking material that you would like to share to a engine building rookie?Engine is 1146 with pistons from SACS engine, raised compression, head is ported and with 1mm oversize valves; Akrapovic 4-2-1 exhaust and standard BST40 carbs w/airbox. Quote Link to comment
Gixer1460 Posted August 29, 2015 Share Posted August 29, 2015 Two inlet cams in Busa motors used to be a hop up tip back in the day - so why not give it a go, just make sure you have decent piston - valve clearance (1.0mm) if pulling big revs! Quote Link to comment
Kristjan Posted August 29, 2015 Author Share Posted August 29, 2015 Running stock ECU, so rev limit goes by that. I'm aware of tight PTVC on these and having 1127 pistons in there does not make it more safe. So I will be checking clearances to be sure. Naturally aspirated, so I'm giving it some from time to time. Have seen a few blow up and have one trophy head myself, so fully aware of what "not enough room" means. Quote Link to comment
kja.busa Posted August 31, 2015 Share Posted August 31, 2015 (edited) The two inlet cams is worth a try, its not only busa's that benefit, around 5bhp, but GSX1400's too. Timed around 108/108 for starters. Edited August 31, 2015 by kja.busa Quote Link to comment
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