homer Posted July 26, 2017 Share Posted July 26, 2017 I have slightly damaged efe engine waiting for pickup. Seller discribed the damage and I am not sure about the head is it worth repairing. Dont want to sell my kidney to get a replacement. Gsxr heads are so much cheaper and I have always wanted to do this gsxr to gsx head swap. Is it worth doing or should I just keep the gsx head. I know I can do it but just want some opinions. Engine will be NA big bore with efi Quote Link to comment
Gixer1460 Posted July 26, 2017 Share Posted July 26, 2017 It can be done but its not totally straight forward. The potential issue is the cam chain tunnel overlaps with the gasket - without some reworking its fairly minimal. Heres one I did a while ago - Gorilla block, 80.5mm GSXR pistons, Katana rods, stripped out GSXR1100K head, flowed and ported with 30/26mm SS valves, G28/G21 cams and about 14:1 CR! Using Race gas was pushing 175-180hp but never got to add the NOS! Pics are when I was thinking of turbo and methanol........ Oil flow / pressure was uprated with 750 gears but because the oily head cooling is piss poor - needs a reasonable oil cooler ( I used a 9 row on a drag bike) It would need more on a road bike. 2 Quote Link to comment
homer Posted July 27, 2017 Author Share Posted July 27, 2017 So it sounds it is worth doing. Is there something else than block return oil pipes, block the external head oil feed, fit gsx cam sprockets, chain tunnel rework, efe studs and gasket? Quote Link to comment
no class Posted July 27, 2017 Share Posted July 27, 2017 I wonder if keeping the oil feed to the head could work if plumbed into the lower case where a turbo oil feed goes? Obviously a higher volume pump gear would be needed . Quote Link to comment
Gixer1460 Posted July 27, 2017 Share Posted July 27, 2017 4 minutes ago, no class said: I wonder if keeping the oil feed to the head could work if plumbed into the lower case where a turbo oil feed goes? Obviously a higher volume pump gear would be needed . GSX pump, even uprated doesn't come close to moving 80 gallons / hr that the GSXR pump puts through their cooling circuit Quote Link to comment
boilerdude Posted July 27, 2017 Share Posted July 27, 2017 So it's really not a reliable option on the street. But acceptable for an all out drag bike. Quote Link to comment
Duckndive Posted July 27, 2017 Share Posted July 27, 2017 4 hours ago, boilerdude said: So it's really not a reliable option on the street. But acceptable for an all out drag bike. 1st one I did was a 1260 with a gsxr dot head ran on the street no probs...only died when it ate a stone at east Kirkby Quote Link to comment
boilerdude Posted July 28, 2017 Share Posted July 28, 2017 Lol you guys and your open stacks... "But it sounds better! And those filters hold back 3 horsepower! Oh whoops what was that? a pebble? Oh well there's goes 5,000 dollars."... Quote Link to comment
Duckndive Posted July 28, 2017 Share Posted July 28, 2017 1 hour ago, boilerdude said: Lol you guys and your open stacks... "But it sounds better! And those filters hold back 3 horsepower! Oh whoops what was that? a pebble? Oh well there's goes 5,000 dollars."... It swallowed a tiny stone flicked up by the back tyre while doing burnout at a RWYB.... held no 3 inlet valve open.. So horny piston kisses valve ..rod goes south in a bendy sort of way piston disintegrated taking out the liner and crank......I have it on video some-ware .... I still have the block need to get round to fitting new liner one day..... Here's the Horny Rod after kissing the naughty valve 5 Quote Link to comment
boilerdude Posted July 28, 2017 Share Posted July 28, 2017 Thats why my carbs always wear protection. 1 Quote Link to comment
ET81 Posted July 28, 2017 Share Posted July 28, 2017 8 hours ago, Duckndive said: It swallowed a tiny stone flicked up by the back tyre while doing burnout at a RWYB.... held no 3 inlet valve open.. So horny piston kisses valve ..rod goes south in a bendy sort of way piston disintegrated taking out the liner and crank......I have it on video some-ware .... I still have the block need to get round to fitting new liner one day..... Here's the Horny Rod after kissing the naughty valve damn that sucks, i prefer filters as well Quote Link to comment
Gixer1460 Posted July 29, 2017 Share Posted July 29, 2017 Funny enough Clive, I was at E Kirby and after a run the turbo on the Kawazuki didn't return to idle so clicked it off and rolled back to the pit. Wow - 6mm pebble loosely wedged between the S&S butterfly and body ! How lucky was that - could have been a mess! Just to teach it a lesson it got a right spanking the next run! And yes a filter would have been a good idea but as both my knees were spread wide - left to avoid the burning hot dump pipe and right to avoid choking the carb with my jeans - i'd have to have double jointed hip to get a filter on there! 3 Quote Link to comment
Dezza Posted July 31, 2017 Share Posted July 31, 2017 EFE head currently on Eblag. Quote Link to comment
kitkatman Posted July 31, 2017 Share Posted July 31, 2017 What sort of damage is there to the EF head, because I have an EF head that's been damaged by rings or valve breakage in its past. Some of the marks are about 2 mm deep. So how do you go about fixing it ????. Quote Link to comment
Gixer1460 Posted July 31, 2017 Share Posted July 31, 2017 Unless you are OCD and need everything perfect and providing none of the valve seats and plug threads are damaged - just use it! Make sure there are no sharp edges to get hot / melt and it should be fine. There may be some slight imbalance in combustion chamber volumes but probably not enough to make 2/10th of FA difference! 3 Quote Link to comment
kiwi Posted August 2, 2017 Share Posted August 2, 2017 Homer get in touch with Stuart Crane Warspeed racing he's breaking an effie engine as he only needs crankcases. Quote Link to comment
homer Posted August 3, 2017 Author Share Posted August 3, 2017 (edited) I am in no hurry. Just thinking what to do with that engine and at the moment cash seems to go anywhere else Edited August 3, 2017 by homer Quote Link to comment
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