12/19/2023 0 Comments Squish head![]() ![]() The combustion efficiency allows the head to burn as much of the available fuel as possible, which pairs well with the generally lean stock map. TT: How will these work with a TPI model?ĪTI: Long story short is these heads are designed to get the most out of the stock map without a re-flash. While generally you will see improvement with a basic manual lathe head mod, there’s more to it than “what compression ratio do you want?” You also miss out on the extra cooling and the interchangeability of the billet heads which is a big plus in my opinion. We offer OEM head machining services, which use the same CNC precision as our billet heads. TT: Can I just have my OEM head cut for the same benefits?ĪTI: You can have your stock head cut, but beware of who you go to. Interchangeable combustion chambers (domes) allow riders to dial in the power characteristics to suit their riding style & conditions. It is best suited towards enduro, single track, technical hill climbs, slick conditions, or for anyone wanting a smooth, torquey response. The XC dome is designed for smooth, linear power with an emphasis on low end luggability and traction. It generally works well for desert riding, general motocross, flowy woods, and play riding. It is smoother than the SX but more aggressive than the XC, and revs the fastest. The MX, or MXC in the case of the 300, is designed for linear power with an emphasis on top end and overrev. It generally works well for supercross, arenacross, aggressive woods riding, general motocross, and high altitude. ![]() ![]() Hard hitting low to mid with the most peak power and torque. The SX dome will have the most aggressive power. TT: How do the different domes change the power characteristics?ĪTI: We change several aspects of the combustion chamber design to give the unique power characteristics of each dome: Oh, you want arm ripping power? We can get you that too, and everything in between! More detonation resistance is another benefit, along with most users reporting increases in fuel economy, particularly on carbed models. ![]() More control, more traction, and less stalling are what the user would gain. Our XC dome adds to the smoothness of the stock bike by adding torque in this area and giving a more linear response to throttle inputs. We noticed particularly with TPI models the throttle response does not necessarily feel connected to the response you get from the engine there's a bit of hesitation off idle at low throttle openings, then the torque comes in as the engine builds some momentum. Carbed models benefit form much more consistent jetting, 6000ft elevation gains and 60℉ temperature swings without changing jets are a huge plus with these setups. TT: What benefits should riders running an Apex head expect?ĪTI: While more power is certainly a benefit of these heads, it goes beyond that. The end result is a quick, complete deflagration that uses as much of the fuel available without giving it a chance to detonate. There are several aspects that we optimize, these include the squish clearance, squish velocity, compression ratio, the overall shape of the combustion chamber, etc. The goal with our heads is to increase combustion efficiency to get an all around healthier running engine. In fact, many of our domes are lower compression than the stock heads they replace. TT: Matt, thanks for taking the time! What’s up with your 2 stroke cylinder head kits are they just another high compression option?ĪTI: Our heads are much more than a high compression head. Apex cylinder heads are designed to have increased combustion efficiency and feature interchangeable domes that allow riders to tailor power characteristics to suit various riding conditions. Recently, we had a chance to talk with Matt Denecke, a die-hard 2 stroke rider & owner of Apex Technical Innovations (ATI), a small but passionate manufacturer of innovative billet cylinder head kits based out of Faber Virginia. Because of this, we’re seeing a resurgence at local races, events like RedBull Straight Rhythm, and those riding just for fun. While professional MX is still dominated by 4 strokes, the simplicity, lightness, & character of 2 strokes makes them dominant in the off-road world. Nobody can deny that 2 strokes are in the midst of a revival. ![]()
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