keltik Posted June 22, 2022 Share Posted June 22, 2022 15 minutes ago, GARDRB said: I'd say if it were publicised, say on YouTube he might end up with more money than he needs Eventually views could fund it, but only after 4 years of advertising wallets, hello fresh and vpns. 7 1 Quote Link to comment Share on other sites More sharing options...
kpr Posted June 22, 2022 Share Posted June 22, 2022 Yeah youtube money ain't nothing. unless your pulling 200k+ views per video @Roman how much stuff is in the way / how much of a straight run is there after that collector ? maybe can slice the collector off and extend them? 4 Quote Link to comment Share on other sites More sharing options...
Roman Posted June 22, 2022 Author Share Posted June 22, 2022 After that collector it's basically a straight run. Could probably easy-ishly convert it to a long 4-1 or 4-2-1 The cat converter normally starts fairly close to where this is cut off. Which is interesting because my understanding is the idea of the short 4-1 design is to get heat into the cat converter quicker. but it's not right up against the extractors. Maybe a single pipe just loses a lot less heat than 4 small ones. EDIT: That reminds me I've seen this mentioned somewhere before. This was in a paper about the 2ZZ motor. Interesting to see how much heat is lost by having individual pipes in a 2-1 section. Also the power losses from having a gap in the flexy join to the 2-1 section. 4kw loss for a 4mm gap! 5 1 Quote Link to comment Share on other sites More sharing options...
kpr Posted June 22, 2022 Share Posted June 22, 2022 send me some stock ones and some kinda way of knowing what space got to work with. will see if can knock something up for you. I'll take over the roman dave go fund me OS donations to pay for materials haha. Whats the od of the tube? Yeah that part is pretty sensitive, and seems like another indication anti revision chambers are bs. Almost looks like that pipe in pic directly after the merge has a choke section then a cone out. well a peasant version of that setup. 4 2 Quote Link to comment Share on other sites More sharing options...
h4nd Posted June 23, 2022 Share Posted June 23, 2022 Uh oh, more tuning options? https://garage.redline360.com/4-1-vs-4-2-1-headers-what-is-the-difference-what-makes-more-power Quote Link to comment Share on other sites More sharing options...
xsspeed Posted June 23, 2022 Share Posted June 23, 2022 = moar graphs Quote Link to comment Share on other sites More sharing options...
xsspeed Posted June 23, 2022 Share Posted June 23, 2022 2 hours ago, kpr said: choke section then a cone out tech spam question but what does this actually do? I seem to recall it being in the black arts of 4age and 3sge exhaust design Quote Link to comment Share on other sites More sharing options...
Spencer Posted June 23, 2022 Share Posted June 23, 2022 OK so we are pooling funds for some KPR headers and a block. Send some stockers and the tail pipe section off the back of them for template. 4 Quote Link to comment Share on other sites More sharing options...
kpr Posted June 23, 2022 Share Posted June 23, 2022 Not sure how to explain the science behind it. but If mess around with sizes and cone angles etc can grab power in different places. the more aggressive the angle is seems give more bottom end. can do some massive megaphone setup. but fitment is an issue in most cases. the double cone setup ive been using on my stuff seems to be a good compromise. The "choke" section, basically want to go small as possible without restricting power. then cone out. 3 Quote Link to comment Share on other sites More sharing options...
GARDRB Posted June 23, 2022 Share Posted June 23, 2022 20 hours ago, keltik said: Eventually views could fund it, but only after 4 years of advertising wallets, hello fresh and vpns. I was meaning more if a givealittle was publicised on youtube Quote Link to comment Share on other sites More sharing options...
GARDRB Posted June 23, 2022 Share Posted June 23, 2022 @Romanmove to Whangarei and we can see what that guy at Garage1nz can get out of it 1 1 Quote Link to comment Share on other sites More sharing options...
Popular Post sheepers Posted June 23, 2022 Popular Post Share Posted June 23, 2022 I'll make an exhaust for it if you want. 10 3 Quote Link to comment Share on other sites More sharing options...
RUNAMUCK Posted June 23, 2022 Share Posted June 23, 2022 Take give a little donations to build a 1500cc motor that wont pop. (After the 1300 lark) 1 Quote Link to comment Share on other sites More sharing options...
Popular Post Roman Posted June 26, 2022 Author Popular Post Share Posted June 26, 2022 Finally had some time to get the old motor out. I was busy just dealing with the nuts and bolts of the situation, undoing things etc... It wasnt until the motor was completely out, that I had a look at the back side of the block and had a hearty chuckle So I got the motor and gearbox out, split the gearbox off. Then I wanted to get the piston and the top half of the rod out, to see if there's any evidence of how/why the rod broke. So I used an extension bar and tapped the piston up until it popped out. Well, part of it anyway... And then I laughed some more, oh man, I wasnt expecting that carnage! I cant find the wrist pin or the top of the rod anywhere. I suspect I might have to go for a long walk up the road to go find it. So one concerning thing about this, is now I'm not sure what broke first. If the rod broke and caused the damage, that's fine. Easy, just put stronger rods in. But it looks like the piston broke along the line of the oil return holes from the oil control rings: Which maybe makes me think that the piston sorta... fell in half. Then caused rod carnage. However I'm thinking this is less likely, based on the lack of damage to the cylinder head. Either way, it might be a good idea to drill some tiny chamfers on the oil holes next time for stress relief. But I'm not sure if you can get a drill anywhere near it while the piston is intact. So, hopefully the rods are the problem and not this haha. Maybe the remaining 3 pistons and rods might show some extra clues. 15 5 Quote Link to comment Share on other sites More sharing options...
ajg193 Posted June 26, 2022 Share Posted June 26, 2022 4K pistons always crack from the stress relief holes drilled at the ends of the oil return grooves. Results in rods chewing up the bore. Time to get yourself some expensive swedish pistons, that sort of thing is your bag. 1 3 Quote Link to comment Share on other sites More sharing options...
cletus Posted June 26, 2022 Share Posted June 26, 2022 Sort of/not really relevant but I've heard stories of holden 6 pistons breaking in a similar fashion except the skirt and wrist pin part comes off , the top of the piston stays there and the rod keeps going up and down as the skirts keep it located correctly 3 Quote Link to comment Share on other sites More sharing options...
RUNAMUCK Posted June 26, 2022 Share Posted June 26, 2022 I had an engine where a piston broke. Based on the galling in what was left of the pin bore, it actually looked like the pin may have seized prior to the piston disintegrating. Theres a rule of thumb for maximum piston speed before forged pistons are required. Quote Link to comment Share on other sites More sharing options...
RUNAMUCK Posted June 26, 2022 Share Posted June 26, 2022 The formula for max piston speed can be found here, http://www3.sympatico.ca/big-d/polytek.htm Disclaimer, this page is just something I found on the net in the mid 2000s. Beyond that I cant vouch for accuracy etc 1 Quote Link to comment Share on other sites More sharing options...
Popular Post Roman Posted June 26, 2022 Author Popular Post Share Posted June 26, 2022 "In a high performance application 3500 FPM can be used since the burst at that speed will be short in duration" 9000RPM 1NZ is 5000fpm hahaha I know it's probably a different kettle of fish for tiny pistons compared to V8 stuff, but... yeah. It's getting up there. 7 1 3 Quote Link to comment Share on other sites More sharing options...
Valiant Posted June 26, 2022 Share Posted June 26, 2022 Lols at the comparisons being drawn between this and other high performance engines of the ilk, such as K series, A series, and Holden 6. 4 2 2 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.