need some inputs so im looking to buy this car this has a fully built 4 piston motor in it if i get the car i wanted to run on 93 pump gas dont want to mess with e85 or race gas the car would just be like a weekend car to go have fun on the streets not ive talked to few diff ppl im getting different answers some are saying that i cant run that car on 93 ill get knocking and detonation will occur others saying i can just has to be tuned right and lower timing, i just want to run on 93 so i just want to knw if i can get it tuned on 93 or not and if i can will it be safe for me to rip it etc and not have to worry about damaging the motor the compression is 12:5.1 heres some of the parts in the build 4Piston K24-K400 2.5L Endurance complete engine
- K24 block core
- K20 PRB cylinder head core
- ERL Superdeck ductile iron cylinder sleeves
*includes billet cylinder support system
*includes precision diamond bore and hone
*includes surface decking
*includes ARP main studs
- Wiseco pistons, armored plated 12.5 : 1
- Manley H-beam K24 connecting rods 14015-4
- ACL Race Bearings
*main bearings
*rod bearings
*thrust bearings
- 4 Piston Racing Pro 163DW CNC cylinder head
*38mm intake seats
*37mm intake valves
*30mm exhaust valves
*bronze guides
*surface, valve job, hone guides, flow test
- Ferrara valve spring kit, titanium retainers, spring seats
- Ferrara 7 degree valve lock K10034
- Viton valve seals
- VTC intake gear / DC adjustable exhaust gear
- 4 Piston Racing 3 lobe iVtec camshaft
*Stage 4 - 600/560 - 266/260
- Cometic MLS head gasket
- OEM Borg Warner timing chain K-series
- OEM timing chain tensioner
- OEM chain guides
- OEM Type S oil pump
*ported to prevent cavitation above 9000rpm
*cleaned, reassembled, oiled
*notched for K24 block
- Skunk2 billet timing chain cover
- 4 Piston Racing long block assembly
*chamfer and debur all sharp edges and oil galleys
*chamfer bearing housings and bottom of cylinder bore
*High pressure thorough cleaning of oil galleys and crankshaft
*Mic pistons and verify straight bore with precision Sunnen bore gauge
*Set piston to wall clearence
*Set ring gap
*Balance rotating assembly
*Set bearing clearances
*Race preparation and debur piston dome
K-series Kinsler 62mm ITBS
*CNC port matched to 4 Piston Pro 163 port

 

I have a 12:5:1 b20vtec and had it tuned on 94..I think you will be fine as long as you get the car tuned.

Personally i would call 4 piston and get their opinion first as they put the motor together.

 

i saw that car for sale on fb, red rsx right? **** is pretty much the perfect a/m street car. anyway, you can run 93 with 12.5 just fine. lots of guys do it. 4P built it for pump gas, you can trust itll be fine with pump gas.

 

Yep. Perfectly fine as long as it is well-tuned. Still have my b-series at that compression over 10 years.

 

I've done it on 91, so yeah

 

k20z1ej1 yea it was the red rsx on fb, considering getting it thanks guys

 

13.0 cr with 94 octane also here!!!k series 280whp+