B20v, 92 octane compression limit?
#1
B20v, 92 octane compression limit?
How's it going everyone, I want to build a b20v and have a few questions. Hopefully the gurus here can help me out. I'm shooting for 230whp on pump gas and want to know if my setup will run well on 92 octane without ping/detonation. E85 is not an option.
B16 head and b20b block
3" intake w/ v stack
Skunk 2? 70mm TB
Edelbrock Performer X intake manifold
Super tech springs & retainers
ITR Intake/oem exhaust valves or ferrea 5000
Skunk 2 pro 2 cams
AEM cam gears
ARP head studs
Golden Eagle 84.5mm b20v kit
RS Machine 84.5mm ITR pistons
Stock rods
ARP rodbolts
ACL main & rod bearings
Type R oil pump
PLM RMF-V3 header
3" Exhaust
i don't know what injectors or fuel pump I want to go with yet but I'm thinking hondata s300 for management. With a good tune should this setup run fine on 92 octane? And do you think I'll reach my hp goals? Thanks in advance everyone and happy New Years. Feel free to chime in on parts you recommend that I'm missing.
3" intake w/ v stack
Skunk 2? 70mm TB
Edelbrock Performer X intake manifold
Super tech springs & retainers
ITR Intake/oem exhaust valves or ferrea 5000
Skunk 2 pro 2 cams
AEM cam gears
ARP head studs
Golden Eagle 84.5mm b20v kit
RS Machine 84.5mm ITR pistons
Stock rods
ARP rodbolts
ACL main & rod bearings
Type R oil pump
PLM RMF-V3 header
3" Exhaust
i don't know what injectors or fuel pump I want to go with yet but I'm thinking hondata s300 for management. With a good tune should this setup run fine on 92 octane? And do you think I'll reach my hp goals? Thanks in advance everyone and happy New Years. Feel free to chime in on parts you recommend that I'm missing.
#2
Honda-Tech Member
Re: B20v, 92 octane compression limit?
Would recommend a 1320 manifold over the PLM, and either a Ktuned or S90 throttle body over the Skunk2 (would also bump the throttle body size up to 74mm to match your 3" intake). Make sure you port match the manifold to the TB as well. I think your cams are oversized for this application as well, the Pro1 would be a better choice.
RS ITR pistons will put you right around 11.8 or so on compression if I'm thinking of the right set, which is very fine with a decent tune on 92 oct. Everything else on your build list looks great.
RS ITR pistons will put you right around 11.8 or so on compression if I'm thinking of the right set, which is very fine with a decent tune on 92 oct. Everything else on your build list looks great.
#3
Moderator
iTrader: (14)
Re: B20v, 92 octane compression limit?
Would recommend a 1320 manifold over the PLM, and either a Ktuned or S90 throttle body over the Skunk2 (would also bump the throttle body size up to 74mm to match your 3" intake). Make sure you port match the manifold to the TB as well. I think your cams are oversized for this application as well, the Pro1 would be a better choice.
RS ITR pistons will put you right around 11.8 or so on compression if I'm thinking of the right set, which is very fine with a decent tune on 92 oct. Everything else on your build list looks great.
RS ITR pistons will put you right around 11.8 or so on compression if I'm thinking of the right set, which is very fine with a decent tune on 92 oct. Everything else on your build list looks great.
#4
Re: B20v, 92 octane compression limit?
Thanks for the responses guys. I'll explore my throttle body options a little more and also talk to my local tuners to see what they think about the static compression/cam combo I want to run. As for fueling, any suggestions on injectors? I want to stay away from 440's, I've heard they're sort of an antiquated design and their spray pattern isnt the best. Also, would a standard Walbro 255 do the trick?
Cheers
Cheers
#5
Honda-Tech Member
Re: B20v, 92 octane compression limit?
Thanks for the responses guys. I'll explore my throttle body options a little more and also talk to my local tuners to see what they think about the static compression/cam combo I want to run. As for fueling, any suggestions on injectors? I want to stay away from 440's, I've heard they're sort of an antiquated design and their spray pattern isnt the best. Also, would a standard Walbro 255 do the trick?
Cheers
Cheers
RC injector styles are very antiquated, Bosch is the "new" hotness. As for brands, any FIC/FID/ID injectors would work.
Note on the FID injectors - I bought some at a cheaper price for a turbo S2000 awhile back, 1000cc. They performed and flowed great, no problems on the dyno or road, but the O-Ring didn't seat quite correctly. Had to use some RTV sealant to close it all off. If you consider FID you may want to ask them if they're familiar with that issue or if they know a better fix.
#6
Moderator
iTrader: (14)
Re: B20v, 92 octane compression limit?
Thanks for the responses guys. I'll explore my throttle body options a little more and also talk to my local tuners to see what they think about the static compression/cam combo I want to run. As for fueling, any suggestions on injectors? I want to stay away from 440's, I've heard they're sort of an antiquated design and their spray pattern isnt the best. Also, would a standard Walbro 255 do the trick?
Cheers
Cheers
As for the Walboro 255lph pump (G342) yes, you're perfectly fine with using that.
#7
Re: B20v, 92 octane compression limit?
I wasn't trying to imply that I wanted to run factory injectors, just not the rc 440cc style. Sorry if that was unclear. But glad to hear that a walbro 255 will work as they can be had for a good price. I like the idea of using rdx injectors, oem quality is always a plus. Again thanks for the insight guysI think I'm going to see Rich-Tuned in Auburn for the tune. He's fairly local to me and I hear lots of good things
Last edited by ScubaZ6; 01-03-2018 at 03:14 PM. Reason: Adding info
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#8
Honda-Tech Member
Re: B20v, 92 octane compression limit?
I wasn't trying to imply that I wanted to run factory injectors, just not the rc 440cc style. Sorry if that was unclear. But glad to hear that a walbro 255 will work as they can be had for a good price. I like the idea of using rdx injectors, oem quality is always a plus. Again thanks for the insight guysI think I'm going to see Rich-Tuned in Auburn for the tune. He's fairly local to me and I hear lots of good things
#9
Re: B20v, 92 octane compression limit?
Would recommend a 1320 manifold over the PLM, and either a Ktuned or S90 throttle body over the Skunk2 (would also bump the throttle body size up to 74mm to match your 3" intake). Make sure you port match the manifold to the TB as well. I think your cams are oversized for this application as well, the Pro1 would be a better choice.
RS ITR pistons will put you right around 11.8 or so on compression if I'm thinking of the right set, which is very fine with a decent tune on 92 oct. Everything else on your build list looks great.
RS ITR pistons will put you right around 11.8 or so on compression if I'm thinking of the right set, which is very fine with a decent tune on 92 oct. Everything else on your build list looks great.
Why are you recommending smaller cams with high compression in order to reach 230 dude? Have you measured pro 1 cams? If so , please tell me what they came out to be when you did. Because I have numbers of pro 1 cams and it makes sense they only produced 208 whp and 151 tq on a stock block b20 with stock gsr head with skunk 2 ultra street and skunk 2 header on e85. On many occasions we made a wee bit less using only ctr cams granted with different intake manifolds but with similar headers.
#10
Honda-Tech Member
Re: B20v, 92 octane compression limit?
Why are you recommending smaller cams with high compression in order to reach 230 dude? Have you measured pro 1 cams? If so , please tell me what they came out to be when you did. Because I have numbers of pro 1 cams and it makes sense they only produced 208 whp and 151 tq on a stock block b20 with stock gsr head with skunk 2 ultra street and skunk 2 header on e85. On many occasions we made a wee bit less using only ctr cams granted with different intake manifolds but with similar headers.
Pro 1 cams still carry power to 9K RPM, which I think is safe to say is actually over the max RPM that OP will be going to on stock rods.
OP is not using E85, nor is he using an S2 ultra mani.
Oversizing the cams will just sacrifice power down low and make the car harder to drive, and MPG will suffer. Increased valvetrain wear. All for no point or reason.
If OP were to raise compression above the 12:1 mark and/or get forged rods to rev higher and get the full juice out of the Pro2 cams, then it would make more sense.
#11
Re: B20v, 92 octane compression limit?
Since this is at least the second time i've asked you to give your .050 numbers, i can only assume you have never degreed pro series cams. Because pro 1 cams arent as big as you think they are, neither are pro 2 cams. the OP's choice of parts is good other than his IM for his power goal. From the numbers ive seen when pro 1s were degreed and from looking at various motors using them, the OP here isnt overcammed
#12
Honda-Tech Member
Re: B20v, 92 octane compression limit?
Nope. Gettin out of here.
#13
Re: B20v, 92 octane compression limit?
#14
Honda-Tech Member
Re: B20v, 92 octane compression limit?
With a cam this big on the primary lobe(pro 2).I dont mind running this engine with 12.5 cr piston.I run 13.0 cr on 94 octane with ultra 2.
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