hodge Posted May 24, 2011 Share Posted May 24, 2011 Would you say it was high horse power or increased rev limits that force the rods to snap. Now I know that anywhere around 800hp the rod bolts become the weak point. But what about the rods. How much will they take before breaking. What are your opinions Quote Link to comment Share on other sites More sharing options...
mellonman Posted May 24, 2011 Share Posted May 24, 2011 maybe hydrolock if your running water injection or failed plug causing cylinder to be full of liquid which would be harder to compress, i dont know but have herd some story's and story's being the word you just dont know what happens for fact. Quote Link to comment Share on other sites More sharing options...
JamieP Posted May 24, 2011 Share Posted May 24, 2011 I did this to one at about 750-800bhp on a top speed run, flat out in 6th. Quote Link to comment Share on other sites More sharing options...
Ricky49 Posted May 24, 2011 Share Posted May 24, 2011 Ha that's foooked, I'm going to turn my boost down from now on. Quote Link to comment Share on other sites More sharing options...
skippyboyo1 Posted May 24, 2011 Share Posted May 24, 2011 ohhhhhh dear! Quote Link to comment Share on other sites More sharing options...
JamieP Posted May 24, 2011 Share Posted May 24, 2011 I tell you what though, when it first happened the engine knocked like mad, i drove all the way home from thunder road and just as i got home the knocking went away, i drove that car like a loon on the way to lee's to pull the engine and it was faultless, no smoke, no noise and felt as fast as it ever was, all with a twisted/bent rod. This was the run i did it on. Quote Link to comment Share on other sites More sharing options...
skippyboyo1 Posted May 24, 2011 Share Posted May 24, 2011 I tell you what though, when it first happened the engine knocked like mad, i drove all the way home from thunder road and just as i got home the knocking went away, i drove that car like a loon on the way to lee's to pull the engine and it was faultless, no smoke, no noise and felt as fast as it ever was, all with a twisted/bent rod. i wasnt a member when you did that by the looks of things,my god its amazing how such a part can bend like that! good work j Quote Link to comment Share on other sites More sharing options...
hodge Posted May 24, 2011 Author Share Posted May 24, 2011 What sort of rev limit was that Jamie. I'm just trying to get my head around reasons for failer. Now I've fitted ARP bolts and studs throughout my engine. I'm just wondering how much abuse the rods and pistons themselves will take before the rod snaps. Quote Link to comment Share on other sites More sharing options...
Bailey. Posted May 24, 2011 Share Posted May 24, 2011 So any idea what actually caused that Jamie? You did a good job. What turbo and what boost? Quote Link to comment Share on other sites More sharing options...
mellonman Posted May 24, 2011 Share Posted May 24, 2011 wow that is bent, Quote Link to comment Share on other sites More sharing options...
mellonman Posted May 24, 2011 Share Posted May 24, 2011 there is a trend coming here hate to say it but 3 of the big boys have had trouble jamie,jamesy, now hodge what the hell is going on Quote Link to comment Share on other sites More sharing options...
JamieP Posted May 24, 2011 Share Posted May 24, 2011 So any idea what actually caused that Jamie? You did a good job. What turbo and what boost? No idea, some claimed hydro lock, some say over stressed, im going with over stressed, we checked the logs and there was no sign of a misfire or anything, even in the video it looks faultless. Billet 6765 at 2bar, it made 730bhp at 1.8bar so im guessing it was running about 750 odd, only thing is we never realised till after that the boost was still capped to 1.3bar in top gear, we set it up like that ages ago to help save the engine and forgot about it, when it let go id say it was probs about 600bhp at 1.3bar. Quote Link to comment Share on other sites More sharing options...
johnny g Posted May 24, 2011 Share Posted May 24, 2011 Hodge hasn't had a problem mate, he's just asking. Ricky has fuel issues and Jamesy has an undetermined problem. Quote Link to comment Share on other sites More sharing options...
hodge Posted May 24, 2011 Author Share Posted May 24, 2011 there is a trend coming here hate to say it but 3 of the big boys have had trouble jamie,jamesy, now hodge what the hell is going on No, no mate. No trouble I'm just wanting to have peoples opinions on this that's all. Although I am prepared to be a guinea pig to see what happens if I max it out. Quote Link to comment Share on other sites More sharing options...
mellonman Posted May 24, 2011 Share Posted May 24, 2011 No, no mate. No trouble I'm just wanting to have peoples opinions on this that's all. Although I am prepared to be a guinea pig to see what happens if I max it out. thank god for that then i thought it had happened. rather you then me being the guinea pig on this one mate, you take having to rebuild so very well. Quote Link to comment Share on other sites More sharing options...
JamieP Posted May 24, 2011 Share Posted May 24, 2011 No, no mate. No trouble I'm just wanting to have peoples opinions on this that's all. Although I am prepared to be a guinea pig to see what happens if I max it out. Just go for it mate, cap the boost in 5th/6th and it will have more chance of lasting id say. Quote Link to comment Share on other sites More sharing options...
hodge Posted May 24, 2011 Author Share Posted May 24, 2011 Well Ryan has put 800HP in my head now. So that's what I'm going to aim for. If all goes well tomorrow, he is mapping the car to a bar of boost. I'll put some miles on it over the summer and maybe later in the year I'll get it on a hub dyno n max it out to whatever he can do with it. I've got a spare bare shortblock in the shed I'll build up in the mean time just incase or when it goes bang. Quote Link to comment Share on other sites More sharing options...
hodge Posted May 24, 2011 Author Share Posted May 24, 2011 thank god for that then i thought it had happened. rather you then me being the guinea pig on this one mate, you take having to rebuild so very well. It's all a part of the fun mate. I'll save a lot on cost because I'll do it myself. Quote Link to comment Share on other sites More sharing options...
mellonman Posted May 24, 2011 Share Posted May 24, 2011 fair play if you want a job done properly do it your self Quote Link to comment Share on other sites More sharing options...
Robzki Posted May 24, 2011 Share Posted May 24, 2011 fair play if you want a job done properly do it your self If you want a job done cheaply do it yourself Quote Link to comment Share on other sites More sharing options...
Ricky49 Posted May 24, 2011 Share Posted May 24, 2011 I thought about going for bust as a test, I don't mind rebuilding the engine but I can't justify fooking the block just to go 'oh it lasted to 800+hp.' Quote Link to comment Share on other sites More sharing options...
hodge Posted May 24, 2011 Author Share Posted May 24, 2011 So back to topic. What causes a rod to break. Is it raised RPM or just all out power. Quote Link to comment Share on other sites More sharing options...
Guest jaredb-123 Posted May 24, 2011 Share Posted May 24, 2011 I would say Reving , i cap mine at 7500 , boost will lift ur head l19s will sort that one out . I believe the rod bolts are the weak link . Some of my mates make 812wrhp on a stock bottom end , gas motorsports made a 1000hp ona bottom end . More than anything u will experience valve float on your stock head . This is using toluline mix , good luck Quote Link to comment Share on other sites More sharing options...
hodge Posted May 24, 2011 Author Share Posted May 24, 2011 I would say Reving , i cap mine at 7500 , boost will lift ur head l19s will sort that one out . I believe the rod bolts are the weak link . Some of my mates make 812wrhp on a stock bottom end , gas motorsports made a 1000hp ona bottom end . More than anything u will experience valve float on your stock head . This is using toluline mix , good luck By valve float do you mean the valves not closing quick enough. Before it's Dyno'd I'm going to fit some duel valve springs and titanium retainers. The head is ported and polished and currently fitted with 264 cams for now. Quote Link to comment Share on other sites More sharing options...
Guest jaredb-123 Posted May 24, 2011 Share Posted May 24, 2011 Yeah mate , you should see that power then , just be mindful now that u have larger cams and if the timming belt tensoner snaps it could damge ur engine , titan offer a billet timming belt tensioner . Quote Link to comment Share on other sites More sharing options...
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