02-22-2018, 03:26 PM | #645 | |
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The Following 2 Users Say Thank You to celek For This Useful Post: | Ultramaroon (02-26-2018), Williampreza (02-22-2018) |
02-25-2018, 11:56 AM | #646 |
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My turn for a potentially dumb question. What's the maximum compression we could run on our motors if we only used the DI at higher RPM's? I'm confused because I know that boosted dynamic compression can go pretty darn high (like 16+:1), granted they retard the hell out of the timing to avoid detonation, and with DI we're controlling exactly when the fuel gets put into the piston, so doesn't that also remove the worry for detonation at higher compression? Can we run 15:1 or higher on 93oct with DI?
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02-25-2018, 03:04 PM | #647 |
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Not sure if I'm answering anything here, for sure not on topic, but I've read of some Edelbrock supercharger build that INCREASED static CAR to 13.5:1. It was fully built though...
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The Following User Says Thank You to sato For This Useful Post: | fika84 (02-25-2018) |
02-25-2018, 03:27 PM | #648 | |
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02-25-2018, 06:55 PM | #649 | |
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[ame="https://www.youtube.com/watch?v=9Wc_q_4blyw"]330 HP All Motor 2007 Honda Civic - One Take - YouTube[/ame] I bet 15:1 could be done. I don't know how long it would last. Build the lower end with lightweight, high compression piston/rods...go stroked for torque or destroked for revs...I personally would like revs for NA and tracking. ITB, ported and polished, quality headers, get some lightweight valve train going. Flex fuel setup, run some ethanol. |
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02-26-2018, 10:29 AM | #650 | |
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I'd also like to push the limits of DI and CR with this engine.. Hence the question. If I'm going to have custom pistons built, I'd like to go as high CR as possible. |
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02-26-2018, 12:07 PM | #651 | |
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The Following User Says Thank You to Pat For This Useful Post: | Tristor (03-07-2018) |
02-26-2018, 12:17 PM | #652 | |
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The Revvolution is the thread I'm referring to (he claims to get about 30% more flow on intake side!), however my wife and Mark over at SCR go way back and he's been involved in building Subaru Boxer engines for different series as well. I'm slowly but surely on my way that way Got the spare heads sitting in the garage, just trying to put together my parts wish list first before I pull the trigger. @celek, what are you doing for head flow/upgrades? For those that aren't familiar with that thread - https://www.revvolution.com/blog/201...the-bottom-end |
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The Following User Says Thank You to fika84 For This Useful Post: | Tristor (03-07-2018) |
02-26-2018, 01:02 PM | #653 | |
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The Following User Says Thank You to Irace86.2.0 For This Useful Post: | Tristor (03-07-2018) |
02-26-2018, 02:23 PM | #654 | |
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Anyway, I know SCR pretty well, but don't know any significant engine work they've done on the FA20 other than the Revvolution car. But that's different than we're talking about in this thread, as it has forced induction. So really, what have they done to an FA20 that improves power significantly other than the typical header/tune/etc.? |
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02-26-2018, 02:30 PM | #655 | |
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02-27-2018, 02:54 AM | #656 |
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Even if 14:1 or 15:1 comp were possible, you gotta ask yourself how much more hp you're even gonna make over an already sky high 13:1 or 13.5:1 ratio. You're risking a lot for minimal gains imo.
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02-27-2018, 03:14 AM | #657 |
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It's easy to get such compression. Just swap in cummins diesel
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The Following User Says Thank You to churchx For This Useful Post: | fika84 (02-27-2018) |
02-27-2018, 10:28 PM | #658 |
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When going the NA route.. all gains are desired and it all costs a crap ton of money. So even if it's minimal gains, if I'm putting the money into it, I want all of it!
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The Following User Says Thank You to fika84 For This Useful Post: | Tristor (03-07-2018) |
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2.3ltr, all motor, helpful, hks, hks stroker, informative, na brz |
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