Fredrik_Steen Posted September 18, 2022 Share Posted September 18, 2022 (edited) What are your favourite myths on turbo or suzuki oilcooled engines? Edited September 18, 2022 by Fredrik_Steen 1 Quote Link to comment
Arttu Posted September 19, 2022 Share Posted September 19, 2022 Here goes a pair of very common opposite statements or beliefs: Boost equals power - more boost always means more power. Boost is only measure of restriction - air flow is what makes the power and these have no connection to boost pressure. While both have good amount of thruth in them they are usually used as overly simplified statements which makes them quite misleading. 1 Quote Link to comment
Gixer1460 Posted September 19, 2022 Share Posted September 19, 2022 Could you pls explain the 2nd one as in my experience the first bit is true, in that without restriction or constriction, you can't measure pressure? ie. if a boost pipe blows off the manifold there is no measurable boost although the turbo is still spooled and blowing air. And the second part is confusing as, if two turbo's are run side by side, one flows 600cfm and the other 300cfm, both at a pressure of 1bar, and both fueled correctly for the air volume - which makes more power? I respect your thinking, I just don't understand it this time LOL! Quote Link to comment
Reinhoud Posted September 19, 2022 Share Posted September 19, 2022 On 9/18/2022 at 6:55 PM, Fredrik_Steen said: What are your favourite myths on turbo or suzuki oilcooled engines? I mostly wonder why Americans call an engine a moder 1 Quote Link to comment
Duckndive Posted September 19, 2022 Share Posted September 19, 2022 7 hours ago, Reinhoud said: I mostly wonder why Americans call an engine a moder motor , hood , trunk fender , color the list goes on 1 Quote Link to comment
Arttu Posted September 19, 2022 Share Posted September 19, 2022 10 hours ago, Gixer1460 said: Could you pls explain the 2nd one as in my experience the first bit is true, in that without restriction or constriction, you can't measure pressure? ie. if a boost pipe blows off the manifold there is no measurable boost although the turbo is still spooled and blowing air. And the second part is confusing as, if two turbo's are run side by side, one flows 600cfm and the other 300cfm, both at a pressure of 1bar, and both fueled correctly for the air volume - which makes more power? I respect your thinking, I just don't understand it this time LOL! Ok, let's take a closer look on that. "Boost is only measure of restriction" Well, sort of true. Boost pressure is result of air flow produced by the turbo and restriction of caused by engine. But while it's true it isn't actually telling anything, just stating the obvious. Also it's true that the air mass flow is what dictates the power that the engine can produce. But the catch is that you can't increase the air flow indefinitely without adding pressure. The engine shifts roughly its displacement of air volume at every cycle. Sure you can improve that by tuning cams, ports and so on, but even at the best case you will hit the limit somewhere around 110% of displacement. So if you want more air mass flow through the engine you have to increase the pressure. And the engine doesn't care how the pressure at intake has been generated. It just gasps in that volume of air at given pressure. So it doesn't really matter if the turbo producing the air pressure is capable of flowing 300cfm or 600cfm or whatever. As long as the engine demand doesn't exceed capacity of the turbo. Ok, in reality size of the turbo has some effect on the air flow. A bigger turbo MAY have better efficiency at required pressure / flow point which then results lower intake air temp exhaust back pressure. And those help to get more air flow through the engine at the same boost pressure. But even that can get you only so far. Eventually you just have to increase the pressure to get more flow and power. 2 Quote Link to comment
GeorgeEI7KO Posted September 24, 2022 Share Posted September 24, 2022 On 9/19/2022 at 7:03 PM, Duckndive said: motor , hood , trunk fender , color the list goes on and they drive on the wrong side of the road Quote Link to comment
Captain Chaos Posted September 25, 2022 Share Posted September 25, 2022 8 hours ago, GeorgeEI7KO said: and they drive on the wrong side of the road The right side 1 Quote Link to comment
Joseph Posted September 25, 2022 Share Posted September 25, 2022 26 minutes ago, Captain Chaos said: The right side The other left side Quote Link to comment
Bigkenxx Posted September 28, 2022 Share Posted September 28, 2022 You don’t want more power when you start Quote Link to comment
Madb Posted October 9, 2022 Share Posted October 9, 2022 Is it me or does he contradict himself a lot in that video? Quote Link to comment
Gixer1460 Posted October 9, 2022 Share Posted October 9, 2022 8 hours ago, Madb said: Is it me or does he contradict himself a lot in that video? Wouldn't be surprised - YouTube expert so must be right LOL 1 Quote Link to comment
Wagola Posted October 9, 2022 Share Posted October 9, 2022 On 9/19/2022 at 11:46 AM, Reinhoud said: I mostly wonder why Americans call an engine a moder ALOOMINUM................that's the one that gets me ! Quote Link to comment
Gixer1460 Posted October 9, 2022 Share Posted October 9, 2022 2 hours ago, Wagola said: ALOOMINUM................that's the one that gets me ! And sodder, even though it's spelt correctly - solder! Quote Link to comment
Reinhoud Posted October 10, 2022 Share Posted October 10, 2022 19 hours ago, Wagola said: ALOOMINUM................that's the one that gets me ! Me too, but I learnt not too long ago that the Americans pronounce it actually pretty close as what aluminium was called whwen it was invented/discovered/made. 1 Quote Link to comment
Gixer1460 Posted October 10, 2022 Share Posted October 10, 2022 Only cos they can't spell it correctly! 2 Quote Link to comment
no class Posted October 10, 2022 Share Posted October 10, 2022 … boy… this topic has drifted off course….who gives a fuck about how we all describe shit …. allooominum, aluminium …. lol …. fags = (cigarettes) ( homosexuals) Quote Link to comment
Captain Chaos Posted October 10, 2022 Share Posted October 10, 2022 I call cunts "mate" and I call mates "cunt" 7 Quote Link to comment
Joseph Posted October 20, 2022 Share Posted October 20, 2022 RS flatslides and turbo or not ? Quote Link to comment
Joseph Posted October 21, 2022 Share Posted October 21, 2022 (edited) Also, maybe everyone knows this page, but i found this the other day, which is on topic of this topic : http://www.spartgsxrspecials.com/turbo%20do%20and%20dont.htm Seems interesting for info ? Edited October 21, 2022 by Joseph 1 Quote Link to comment
Gixer1460 Posted October 21, 2022 Share Posted October 21, 2022 Linky no workee! And Turbo's and Flatslides? - NO! Quote Link to comment
Joseph Posted October 21, 2022 Share Posted October 21, 2022 Ah damn, i think its a case of copy paste, can't seem to get it to be clickable As for Flats and turbos inded i noted i had never seen any in any setup, whats the theory behind it ? The vacuum system on CVs is mandatory ? Asking out of technical curiosity Quote Link to comment
Arttu Posted October 21, 2022 Share Posted October 21, 2022 2 hours ago, Joseph said: Also, maybe everyone knows this page, but i found this the other day, which is on topic of this topic : http://www.spartgsxrspecials.com/turbo%20do%20and%20dont.htm Seems interesting for info ? That looks like good basic info package. There isn't much that I can't agree with. Although the focus seems to be on relatively basic turbo installations on carbed bikes. Not really a fault but good to keep in mind when weighing the advice. This link should work: http://www.spartgsxrspecials.com/turbo do and dont.htm 1 Quote Link to comment
Gixer1460 Posted October 21, 2022 Share Posted October 21, 2022 22 minutes ago, Joseph said: As for Flats and turbos indeed i noted i had never seen any in any setup, whats the theory behind it ? The vacuum system on CVs is mandatory ? Asking out of technical curiosity Its as simple as air pressure / volume acting on the slides. When under boost, the amount of air passing through the carb is staggering and has considerable force behind it. Trying to close a slide carb against that pressure is nigh on impossible, therefore its almost a engine runaway condition - engine draws air & fuel, makes boost, more boost = more air etc. With a CV carb the fuel delivery is independent of the throttle blade position and due to the rotary operation its easier to close even with huge air pressure. But pair an HSR42/45/48/50 with a suck through turbo - match made in Heaven! Quote Link to comment
Joseph Posted October 21, 2022 Share Posted October 21, 2022 Right. More or less the feeling i had about it but indeed i couldn't have worded it like that. Thanks Quote Link to comment
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