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Well the GTS has been moved to my new place, once i finish moving this week i have organised a few mates to come round and help me to start stripping the motor down to see if there is anymore damage.
The heads will be taken to a local shop to be machined, looking at taking about 0.070 off them
Cam am going with 216/226 .598" 112LSA
And hopefully just springs, lifters and pushrods as the motor only has 128XXXkms on it.
Cheers
Maccas
Some good pics/info in here....
http://www.ls1.com.au/forum/showthread.php?t=101031
The one with 70k on the clock is somewhat scarey!
Reckon the parts you identified above will sort your engine woes :goodjob:Quote:
Originally Posted by Maccas
Well the motor is pretty much all stripped down now, this weekend the cam etc will be out.
So far so good on damage only minor damage to some of the rollers, will be interesting to see the cam condition. Pistons seem find no issues there.
Cheers
Maccas
70thou is a lot off the heads, It may cause inlet manifold alignment problems and tight piston to valve clearences with a decent size cam.
I wouldn't take much more than 20 thou off.
Well i finally got the cam out, on the upside the cam isnt to bad but some small scores. On the down side it looks like the cam bearings are shagged, so looks like the engine is coming out completely!
Cheers
Ben
Not good to hear Ben...but I guess you can pick what you do to it now
Yeah isnt ideal but am gonna pull the engine out and door all the bearing and clean everything else up!http://uploads.tapatalk-cdn.com/2016...a96470b40a.jpg
Are you for real? 20thou?Quote:
Originally Posted by johnv
30 - 50 thou is quite common and no drama.
Those cam bearings are quite shagged. I've got an LS3 apart in the workshop at the moment that aren't half as bad as that.
Just speaking from experience, bought a set of heads with 50 thou off, and with a 0.605" lift cam I had piston to valve clearance issues, well under recommended minimum, and inlet manifold port alignment was not ideal.Quote:
Originally Posted by VBhero
My estimate at 70 with stock pistons is a comp of about 12:1, what are you chasing?
Remember the GTS is lower compression than a standard LS1, think from memory their 9.8 or 9.9:1. We had figured it would give around the 11.2:1 compression with 70 thou off the heads.
Ok you should be looking 80thou PTV with that cam then.Quote:
Originally Posted by Maccas
Lift means very little when factoring in PTV. Duration and advance have far more of an influence.Quote:
Originally Posted by johnv
It will be about 11.2:1 with 70 off giving ~60cc chamber. Sure as shit won't be anywhere near 12:1. Not sure where you are getting that info from mate.Quote:
Originally Posted by Micks
Ok so for all the experts who think that 70 thou off a 241 head is crazy talk here is some data to show why its hardly a big deal.
Stock LS1
66cc chamber 10.15:1 comp
http://i68.photobucket.com/albums/i3...pses9m8626.jpg
Stock C4B head
I didn't know the chamber vol of the C4B head so I worked my way backwards based off a 9.95:1 SCR getting a 68.4cc chamber
http://i68.photobucket.com/albums/i3...ps0ys9cc9g.jpg
So based on that info when I speced this build I was aiming for mid 11's for the SCR so taking into consideration it takes .007" off a head to drop 1cc (.005 if its off the block which i think might be why people are freaking out) I wanted to drop it 10cc. Hence 70thou. Its also going to be using LS2 gaskets which are a 4.020 bore which takes a little bit away ~.08:1 difference
The end result should be around about this. which is no big stretch what so ever. If anything I'd like to go more, but lets not push the friendship with the heads to much.
http://i68.photobucket.com/albums/i3...psbahcvxxw.jpg
Yes I was a little overzealous in my calculation, the dynamic figure will be lower than static comp ;)
Well the motor has been dropped off to get some meat taken off the heads and new bearings installed throughout the engine. Then the go fast parts will be installed and bring her back to life.
Cant wait to have it back on the road have been missing driving it!
Hurry up already :p
Hahaha trust me John, it feels like its taking forever, but will be worth the wait!
While the engine is away im going to get in and clean up the engine bay as it was filthy and my OCD can't take it any longer hahaha.
So is it finished now???? :stick:
next weekend is build weekend!!! cant wait
Nows the time to do it as well replacing any of those hard to get at niggling things whilst the donk is out too. :goodjob:Quote:
Originally Posted by Maccas
Worst thing is I haven't had the time to do it as ive been detailing heaps of customers cars! Hopefully sort something this week
Well my build is finally happening this weekend. Have all the parts and then some, as decided bugger it ill order a new exhaust while at it so have a sureflo 3.5 inch to go behind some ballistic cats and the pacemaker inch and 3/4 4 into 1s i have here. Today i got out and painted the headers and otr all black with high temp paint. Engine is back after getting all new bearings put through, which im glad i did as found the big end bearings were shagged too. Ended up taking 40 thou off the heads and getting a neg 10thou cometic gasket, giving a total of 50thou off standard height.
Cant wait for this weekend when all the boys come up from melbs and local to help put it back together in the shed and fire it up!
Bring on fun times!
Can't wait to see the result!
Mick
Well build is tomorrow cant bloody wait!
Just not too many drinks & plenty of pics please!Quote:
Originally Posted by Maccas
Yes, looking forward to seeing the results of this. Going to be a very nice little GTS when your are finished :)
Well the motor is back together and in, idling pretty well. But still have to fit the new exhaust as i deceided to lash out and buy a sureflo 3.5inch single system for it, and then a few little tidy up and for the tune to be properly sorted!
We had some hiccups along the way but managed to get them all sorted, starting it in the shed running only off the heads was insane haha put a damn big smile on my face!
Hopefully be on the road in the next 2 weeks or so.
Cheers
Maccas
You have the exhaust so what's the delay ? :stick:Quote:
Originally Posted by Maccas
HAHAHA need to weld the flanges of the cats to align with the headers, and im not a good welder so trying to organise it with some mates.
Well the GTS is back together, only the tune to go which will be done in the next week. New exhaust has been fitted and all other small things tidied up!
Can't wait to get out and drive her!!
http://uploads.tapatalk-cdn.com/2016...07e6572370.jpghttp://uploads.tapatalk-cdn.com/2016...341895d3d5.jpghttp://uploads.tapatalk-cdn.com/2016...e32f439c74.jpg
Quick little video of it running with just a start up tune in it and the new exhuast.
http://i43.photobucket.com/albums/e3...psywvqsv4l.mp4
Sounds great Macca! :goodjob:
Sounds fuccing killer mate, really deep note, love it.
Sounds great, I'd be very proud of that mate! :yup:
Nice work, mate. Any plans to pop the double-D exhaust tips back on? Understand you've opted for the single 3.5" but the look of the double-D??
Mick
Yeah am planning in refitting it, as the rear tip hasnt been fitted yet as im working out how to do the original setup. Love the look of the double D