Is the EVO IX the most powerful 4-Cylinder ever?
660 degrees celsius is over 1200 degrees fahrenheit. At WOT, my turbocharged rotary sees EGT's in the 1,000 C range. The aluminum NEVER sees those sort of temperatures due to the water cooling. So the close proximity of the Sti's turbocharger helps cause the failure...now is it the aluminum that's failing or is the piston/valve, rings, lands going kaput because of elevated temps and knock? If it's the latter, that's not a problem with the aluminum block but rather the engine's layout which you alluded to. I mean the aluminum around that particular cylinder isn't melting away, right? It's not cracking? What about warpage?
I think the new R6 takes the prize for the most hp/liter doesn't it (around 220hp/liter)? I think the original question was outright hp however, not per liter. Semantics. All the new liter bikes are in the 180's with ram air out of 998cc's. I haven't seen the figure for the ZX1400 yet but it's supposed to be close to 200hp! How much you can actually believe the factory claims, well, that's another thread altogether!
there is absolutely no benifit in iron blocks!!!! aluminum block are better because it will take out weight from the car but it cost more. its just cheeper to make them iron. as long as the sleeves are steel or iron then its fine. there is no stress on the block it self only on the sleeves . iron blocks weight more
it only happens on the US spec STI's that get built up using the stock block. the melting point of Aluminum is 660 deg C vs Iron @ 1563 deg C. Al is also only 1/3 the density of Iron as well which is another inhibiting factor when dealing with pressure. if an Al block is designed for forced induction it does well but not AS well as it's Iron counterpart. so if EGT's hang out in the 900+ deg C range on a stock block STI, what do you think is happening? they stuck the turbo right next to the block behind cylinder 3 (pass. side) retarded design IMO. people have to build up there STI blocks to prevent this from occuring. the 2007 STI is rumored with a H6 option which shouldn't have this problem. .
You dont honestly belive that do you? The suby block being aluminum has NOTHING to do with the problem you speak of.
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wrong
there is absolutely no benifit in iron blocks!!!! aluminum block are better because it will take out weight from the car but it cost more. its just cheeper to make them iron. as long as the sleeves are steel or iron then its fine. there is no stress on the block it self only on the sleeves . iron blocks weight more
there is absolutely no benifit in iron blocks!!!! aluminum block are better because it will take out weight from the car but it cost more. its just cheeper to make them iron. as long as the sleeves are steel or iron then its fine. there is no stress on the block it self only on the sleeves . iron blocks weight more
Last edited by sparky; Jan 15, 2007 at 04:27 PM. Reason: retrovisionism
and also.. i was thinkin about the same thing... i think evo also have the most hp per liter.. 143hp/L out of any stock car out there... thats pretty impressive comparing to those american muscle cars... like the 03 cobra which is 4.6L and 390 hp.. 85hp/L
but then again... thinkin about those 93 rx7s.. they are 255hp and only 1.3 which equals to about 196hp/L ..then again...its a rotary...worlds apart from the piston engines... sorry to be off topic if i am
but then again... thinkin about those 93 rx7s.. they are 255hp and only 1.3 which equals to about 196hp/L ..then again...its a rotary...worlds apart from the piston engines... sorry to be off topic if i am
The previously cited BMW Motorsport F1, 1500c.c. engines which put out over 1200H.P., employed aged(used) cast-iron, production blocks in the buildups. The grain structure of high mileage, cast-iron production blocks has already shifted(due to countless heat cycles) and is relatively stable. These "aged" cast-iron blocks tend to maintain the exact dimensionality of precision machining operations, such as align boring etc., much better than new cast iron blocks or new aluminum blocks, when subjected to extreme temps and stess.
SWISH! Excellent point, kudos for the homework.
<----Feldguy dusts off the former Evo owners badge for this one......
In all reality, iron has its benefits and aluminum has its benefits as well.
When it comes to sheer longevity, not race use durability, iron has been proven to hold up quite well. Keith Black blocks are made of aluminum, and they run 8k plus horsepower in top fuel cars.....so strong they are.....
Nothing is impervious to everything, some of the nastiest motors out of Japan are iron blocks......
Some insane hondas in the US are aluminum block (some are insane, im not sure but arent they all AL?)
What Im saying is that just like everything when corrected expectations and reasonable goals are set for anything, tuning becomes the major differentiation.
To say one is better than the other really comes down to saying a tangerine is better than an orange.....its all the same to the people who want a specific flavor.
Its been a long night......damn.
I believe as tim
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I wouldn't say it is the highest NA car in terms of the hp to liter ratio. The RX-8 puts out 238 hp with a 1.3L engine (183hp/L).
The 4G63T, as advertised by Mitsubishi Motors, has the highest horsepower to displacement ratio in the hemisphere. I dont know what else has a higher horsepower to displacement ratio.