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2nd February 2017, 19:54 #101
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That 88 Honda F1 was a VERY different engine, much bigger. We are talking about a 1600cm3 R4 and imho it`s quite impressive, where we are today (not only WRC, but also small cm3 turbo engines on std. road cars but still we can see more reliability issues, like small TSI engines for example).
Last edited by Tarmop; 2nd February 2017 at 19:56.
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2nd February 2017, 20:09 #102
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Bigger? OK, it was V6 but still 1500ccm...
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2nd February 2017, 21:06 #103
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Yes, F1 is different, rules, materials, area of use, fuel, the engine had only 50 mm stroke (closer to motorbikes of today than to cars). The point is that it is better not to use high rews when You don't need to do so. High rews mean also high friction losses (they grow with the square of engine speed) and therefore less efficiency (not only engine but also gearbox).
In this case it's mostly about design flaws. It's possible to design totally reliable small turbo engine for decent price, the best example is 1.0T Ford EcoBoostStupid is as stupid does. Forrest Gump
- Likes: itix (5th February 2017)
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3rd February 2017, 16:53 #104
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That makes sense on the "custom" engines...there IS a need for enough room to have valves of a certain size.....
The valve spring failures well that sound just plain wrong calculations and what I call "getting greedy design/choice wise.
I wonder how many guys here actually build and modify motors for competition???John Vanlandingham
Sleezattle WA, USA
Vive le Prole-le-ralliat
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5th February 2017, 14:22 #105
Sulland meant valve float I am quite sure. It is when the valve springs are not strong enough to close the valve properly given engine speed, boost pressure and cam profile, meaning that the valve and lifter is "floating" above the cam leading to a very abrupt close and valve failure.
- Likes: dimviii (5th February 2017),Mirek (5th February 2017)
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5th February 2017, 15:37 #106
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Thanks, I didn't know the English term.
Stupid is as stupid does. Forrest Gump
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7th February 2017, 23:00 #107
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Quick one on aero and gearing...
I heard that on a long road in Monte there was a 10kph max speed difference between the new cars (202-212kph).
The Fiesta was fastest, then i20 and Yaris was slowest. Will this be mostly gearing or aero, or some of both ?
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8th February 2017, 01:10 #108
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That story about when engine works on limiter, that always about gearing. No?
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8th February 2017, 02:28 #109
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You could hear them on the rev limiter in some videos from Monte, that is definitely rev limiter. Aero should just effect how fast you get to the rev limiter based on drag. But that's just one element, there is also all the usuals like grip, torque, gear ratios and bravery...
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8th February 2017, 07:42 #110
- Likes: Mirek (8th February 2017)
When I go to WRC event, I want to see the best drivers as always. If I want to see some national drivers, I can go to some other less popular event.. Just simple.
[WRC] 80. Rally Poland 2024