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The Terminator
Engine/Tuning
Boosting on 10.2 CR
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<blockquote data-quote="SlowSVT" data-source="post: 13460825" data-attributes="member: 20202"><p>Benz</p><p></p><p>It doesn't work like that. What everyone is fighting is the limit you can compress the charge before it detonates timing not withstanding.</p><p></p><p>I lifted one of my responses to a thread on the NE Cobra section with some edits rather than re-writing it and should clear a few things up for you.</p><p></p><p></p><p><em>It's "charge volume".</em></p><p><em></em></p><p><em>A flat top piston mod motor chamber volume not including deck height and head gasket thickness is 52 cc's, A dished Terminator slug adds another 17 cc of charge volume to the chamber which is a 30% increase. That translates directly on how much fuel the engine can process before the point of detonation with most of the added energy going directly to the crack shaft. The laws of physics comes into play here and to argue otherwise is going to be an uphill battle. <u>Under no circumstances would I choose to use flat top pistons in a blown application</u> (with the exception of E85) and to do so you are leaving hp on the table.</em></p><p><em></em></p><p><em>A 99 Cobra engine with a forged bottom end and a PD blower will hit a brick wall around 425 hp on pump gas where an 03/04 can get close to 600 <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" />idea: Hay! that's about a 30% power advantage imagine that) Switch both engines to race gas and that gap will still be there. <strong>What ever combo you can come up with that 30% charge volume disadvantage thing will be literarily impossible to overcome.</strong></em></p><p><em></em></p><p><em>For a centrifugal or turbo bumping the compression will help reduce the effect of lag and a poor throttle response which is a good idea plus the fact they make mad hp "on top" to begin with but the more you add the less potential the motor will have not being able to pack more boost into the engine. 9:1 tops for me with the exception of E85 which would probably gets me close to 11:1. A PD blown car works great at 8.5:1 and to raise it is pointless and detrimental...........IMO</em></p><p></p><p>I modeled this in CAD to giver you a better idea on how this relates to the mod motor. These are dimensionally accurate including the volumes.</p><p></p><p>[ATTACH=full]504447[/ATTACH]</p><p></p><p>[ATTACH=full]504448[/ATTACH]</p><p></p><p>I hope that helps.</p><p></p><p>Regarding your purchasing dilemma. If your finances are tight wait until your on better footing. Terminators are generally better cared for than you garden variety Mustang that gets put out on the curb once it outlives its usefulness so they will be around more than most.........or you can make one.</p></blockquote><p></p>
[QUOTE="SlowSVT, post: 13460825, member: 20202"] Benz It doesn't work like that. What everyone is fighting is the limit you can compress the charge before it detonates timing not withstanding. I lifted one of my responses to a thread on the NE Cobra section with some edits rather than re-writing it and should clear a few things up for you. [I]It's "charge volume". A flat top piston mod motor chamber volume not including deck height and head gasket thickness is 52 cc's, A dished Terminator slug adds another 17 cc of charge volume to the chamber which is a 30% increase. That translates directly on how much fuel the engine can process before the point of detonation with most of the added energy going directly to the crack shaft. The laws of physics comes into play here and to argue otherwise is going to be an uphill battle. [U]Under no circumstances would I choose to use flat top pistons in a blown application[/U] (with the exception of E85) and to do so you are leaving hp on the table. A 99 Cobra engine with a forged bottom end and a PD blower will hit a brick wall around 425 hp on pump gas where an 03/04 can get close to 600 (:idea: Hay! that's about a 30% power advantage imagine that) Switch both engines to race gas and that gap will still be there. [B]What ever combo you can come up with that 30% charge volume disadvantage thing will be literarily impossible to overcome.[/B] For a centrifugal or turbo bumping the compression will help reduce the effect of lag and a poor throttle response which is a good idea plus the fact they make mad hp "on top" to begin with but the more you add the less potential the motor will have not being able to pack more boost into the engine. 9:1 tops for me with the exception of E85 which would probably gets me close to 11:1. A PD blown car works great at 8.5:1 and to raise it is pointless and detrimental...........IMO[/I] I modeled this in CAD to giver you a better idea on how this relates to the mod motor. These are dimensionally accurate including the volumes. [ATTACH=full]504447[/ATTACH] [ATTACH=full]504448[/ATTACH] I hope that helps. Regarding your purchasing dilemma. If your finances are tight wait until your on better footing. Terminators are generally better cared for than you garden variety Mustang that gets put out on the curb once it outlives its usefulness so they will be around more than most.........or you can make one. [/QUOTE]
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