In for the long haul Ultimate NA build thread. - Page 4 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

xwd · 05-01-2014, 01:18 PM

Quote:

Originally Posted by stevo585

Think about motorcycle engines (not harleys). They all are big bore, short stroke with individual throttle bodies. This allows for more airflow, bigger valves, and high rpms. This is what you need to make big NA power.

Yeah not even just motorcycles, look at any high power high revving NA car. The Porsche GT3 uses a 102mm bore with a really short stroke, like 76mm. Only way you can rev the thing out to 8400RPM and make the kind of power they do.

SubiePig · 05-01-2014, 02:56 PM

Considered trying WPC Treatment for anything?

Turdinator · 05-01-2014, 08:42 PM

Quote:

Originally Posted by stevo585

Think about motorcycle engines (not harleys). They all are big bore, short stroke with individual throttle bodies. This allows for more airflow, bigger valves, and high rpms. This is what you need to make big NA power.

Quote:

Originally Posted by dwx

Yeah not even just motorcycles, look at any high power high revving NA car. The Porsche GT3 uses a 102mm bore with a really short stroke, like 76mm. Only way you can rev the thing out to 8400RPM and make the kind of power they do.

I highly doubt anyone will de-stroke and over bore the FA20. I guess you could run a FB25 block with its 94mm bore and a FB16 crank with 82mm stroke. That would give you 2.3lt roughly. The you could run the FA20 heads with oversized valves and some porting. But who knows if the FB16 crank would hold up to revs as well as the FA20s because it is built for economy not performance.

Would make for an interesting franken engine tho

HLS30 · 05-02-2014, 02:06 AM

Interested for how this goes. Coming from the S30 world, N/A power is what really interests me...

TiggaPlease · 05-02-2014, 08:29 AM

Subscribed

celek · 05-15-2014, 06:15 PM

Shipped my block to Darton in California for some a little TLC and these guys showed up 89.5mm

Bad news is I have to find a new crank though

Guff · 05-16-2014, 05:04 AM

Sub'd

Herndon · 05-16-2014, 05:22 PM

Quote:

Originally Posted by celek

Shipped my block to Darton in California for some a little TLC and these guys showed up 89.5mm

Bad news is I have to find a new crank though

Why the need for a new crank?

Kdej1 · 05-16-2014, 08:32 PM

Right on man I'm an N/A fan myself. I have a k24 civic right now and it's a blast.. I put down 300whp and 221tq on a very simple build.. Car has ran 11's on slicks..
That's pretty much the reason I can't really do another N/A 4 cylinder engine. It just wouldn't be the same

rice_classic · 05-17-2014, 12:25 AM

NA makes me happy.

Subscribed.

Are you looking at pump gas build? You're increasing bore and compression and I think balance/blueprint is assumed, how about cams? Any idea on lobe profile? How extensive will the headwork be?

Panda Mao · 05-17-2014, 01:02 AM

I personally think the FA20 motor is meant for NA build it just compliments the car's natural handling and purpose built I just wish it was cheaper than going boost I feel like for every hp gained via NA vs boost its like 1 hp/$200 vs 1 hp $100 with boost ugh

I hope they come out with more all motor parts especially cams I cant wait to see these babies

suaveflooder · 05-17-2014, 01:56 PM

Quote:

Originally Posted by Kdej1

Right on man I'm an N/A fan myself. I have a k24 civic right now and it's a blast.. I put down 300whp and 221tq on a very simple build.. Car has ran 11's on slicks..
That's pretty much the reason I can't really do another N/A 4 cylinder engine. It just wouldn't be the same

Question for you and OP. How is the reliability on a high horsepower NA build? Is the car capable of being a daily or is it like most highly modified cars that is better off as a weekend warrior? Plan right now, as I mentioned before is to stay NA, but I adamant that the car doesn't loose it's reliability

Sent from my iPhone using Tapatalk

Kdej1 · 05-17-2014, 02:55 PM

It's perfectly reliable (when done right). It's just most people don't like to let their cars fully warm up in the morning. So depending on your internals, this could be the motors undoing.. Not only that but if it's at a good amount of compression, you're going to need some decent gas. For those who have e85 pumps at their disposal, it's not a big deal..

A3r0pusH · 05-17-2014, 03:19 PM

What would one consider as decent gas? 91 is all I have unless I want to drive more than an hour to find a place with e85 or 100 octane.

Sent from my pos phone using tapatalk

05-01-2014, 02:56 PM	#44
SubiePig Senior Member Join Date: Apr 2013 Drives: -'02 PSM WRX, '94 Miata, '13 BRZ Location: Lafayette, Louisiana Posts: 438 Thanks: 188 Thanked 155 Times in 112 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	Considered trying WPC Treatment for anything? __________________ Sponsered by:Chasebays/Corr Performance Tuning/KartBoy/Bad Panda Motorsports/Racer-X Fabrication STX Build thread 14th/67 SCCA Nationals (2014)

05-02-2014, 02:06 AM	#46
HLS30 Member Join Date: Apr 2014 Drives: Heavily modded '72 240Z Location: N37°18'37" W120°29'50" Posts: 14 Thanks: 0 Thanked 6 Times in 3 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Interested for how this goes. Coming from the S30 world, N/A power is what really interests me... __________________ Like modifying cars? Worried about voiding your warranty? Then read up on the Magnuson–Moss Warranty Act, and 42 U.S. Code § 7541!

05-17-2014, 12:25 AM	#52
rice_classic Senior Member Join Date: Jun 2012 Drives: Nevermorange FRS Location: Seattle, WA Posts: 4,160 Thanks: 755 Thanked 4,200 Times in 1,803 Posts Mentioned: 77 Post(s) Tagged: 1 Thread(s)	NA makes me happy. Subscribed. Are you looking at pump gas build? You're increasing bore and compression and I think balance/blueprint is assumed, how about cams? Any idea on lobe profile? How extensive will the headwork be? __________________ SCCA T4 - FRS

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05-02-2014, 08:29 AM	#47
TiggaPlease Member Join Date: Jan 2013 Drives: Asphalt FR-S Location: Atlanta Posts: 55 Thanks: 5 Thanked 12 Times in 11 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Subscribed

05-16-2014, 08:32 PM	#51
Kdej1 Colten Drew Join Date: Mar 2013 Drives: '13 Fr-s // '95 Civic // '09 Vette Location: Phx, AZ Posts: 52 Thanks: 3 Thanked 26 Times in 10 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Right on man I'm an N/A fan myself. I have a k24 civic right now and it's a blast.. I put down 300whp and 221tq on a very simple build.. Car has ran 11's on slicks.. That's pretty much the reason I can't really do another N/A 4 cylinder engine. It just wouldn't be the same

05-17-2014, 02:55 PM	#55
Kdej1 Colten Drew Join Date: Mar 2013 Drives: '13 Fr-s // '95 Civic // '09 Vette Location: Phx, AZ Posts: 52 Thanks: 3 Thanked 26 Times in 10 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	It's perfectly reliable (when done right). It's just most people don't like to let their cars fully warm up in the morning. So depending on your internals, this could be the motors undoing.. Not only that but if it's at a good amount of compression, you're going to need some decent gas. For those who have e85 pumps at their disposal, it's not a big deal..

05-17-2014, 03:19 PM	#56
A3r0pusH Member Join Date: Jan 2014 Drives: 2013 Scion FR-S Firestorm Red Location: Here and There Posts: 76 Thanks: 1 Thanked 28 Times in 15 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	What would one consider as decent gas? 91 is all I have unless I want to drive more than an hour to find a place with e85 or 100 octane. Sent from my pos phone using tapatalk

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