Redfox340 Posted July 10, 2003 Report Share Posted July 10, 2003 I'm posting this because it's late and I'm second guessing myself. Can you change the displacement (literage) of a motor with just a top-end motor swap? - Erik Quote Link to comment Share on other sites More sharing options...
god910 Posted July 10, 2003 Report Share Posted July 10, 2003 ...top-end motor swap Top end eh? You mean heads, intakes, and leave the block the same? The only way to increase displacement is by increasing (or decreasing) the bore and/or stroke. Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted July 10, 2003 Report Share Posted July 10, 2003 I'm posting this because it's late and I'm second guessing myself.Can you change the displacement (literage) of a motor with just a top-end motor swap? - Erik No. Duh Only kidding man Robby Quote Link to comment Share on other sites More sharing options...
Redfox340 Posted July 10, 2003 Author Report Share Posted July 10, 2003 That's what I thought. There's been a newbie back-lash against me over on a L-Body forum about a 3400 SFI swap into a Beretta. A guy wanted (as I interpreted) to go to a 3100 to 3400; told him what's needed and we shot down by "older" member. You really need to read before you try to post good info. The 3400 swap does NOT need the SFI or the ECM it will work on the Multiport fuel injection... because nates running a 3400 5 speed in his 92 GT and hes running high 14s and thats on the multiport code.. Ok... so... is this correct? Are we even on the same page here? :? - Erik Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted July 10, 2003 Report Share Posted July 10, 2003 Sounds that guy is talking about a 3.1L to 3400 top end swap. And, since the motors share the same sensors you can use the ECM from the 3.1L, it will just be Multiport not Sequential Port. Robby Quote Link to comment Share on other sites More sharing options...
Redfox340 Posted July 10, 2003 Author Report Share Posted July 10, 2003 Sounds that guy is talking about a 3.1L to 3400 top end swap. And, since the motors share the same sensors you can use the ECM from the 3.1L, it will just be Multiport not Sequential Port. No, he'll take the 3.1L MPFI ECM and stick it the injectors into the recently swaped 3400 SFI and change it to a 3400 MPFI. - Erik Quote Link to comment Share on other sites More sharing options...
Vegeta Posted July 10, 2003 Report Share Posted July 10, 2003 Right, he has a 3400, not a top end swap. He is running the stock computer and using a reprogrammed FFP chip. Quote Link to comment Share on other sites More sharing options...
NOHC_WBody Posted July 10, 2003 Report Share Posted July 10, 2003 If the combustion chambers on the new heads were bigger, then displacement would technically be increased by a small margin,(a few cc's) but at the same time, you'd go down some points on compression. Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted July 10, 2003 Report Share Posted July 10, 2003 Sounds that guy is talking about a 3.1L to 3400 top end swap. And, since the motors share the same sensors you can use the ECM from the 3.1L, it will just be Multiport not Sequential Port. No, he'll take the 3.1L MPFI ECM and stick it the injectors into the recently swaped 3400 SFI and change it to a 3400 MPFI. - Erik Oh, okay, I see, I misunderstood. :oops: :oops: Robby Quote Link to comment Share on other sites More sharing options...
god910 Posted July 11, 2003 Report Share Posted July 11, 2003 If the combustion chambers on the new heads were bigger, then displacement would technically be increased by a small margin,(a few cc's) but at the same time, you'd go down some points on compression. No, the piston is not moving any more or less. You will lower compression this way, but you won't be changing how big the bore is, or how far the piston will travel. Quote Link to comment Share on other sites More sharing options...
NOHC_WBody Posted July 11, 2003 Report Share Posted July 11, 2003 If the combustion chambers on the new heads were bigger, then displacement would technically be increased by a small margin,(a few cc's) but at the same time, you'd go down some points on compression. No, the piston is not moving any more or less. You will lower compression this way, but you won't be changing how big the bore is, or how far the piston will travel. Displacement would be measured buy how much of a fluid it would take to fill a chamber, in this case the cylinder bore. If the heads with larger combustion chambers will hold more fuel & air, the cylinder will be bigger. Hence, SLIGHTLY more displacement. It's a moot point, like I said before because it would only be a few cc's. Quote Link to comment Share on other sites More sharing options...
god910 Posted July 12, 2003 Report Share Posted July 12, 2003 Sorry, displacement means just that. Piston and head cavity shape can complicate compression ratio (CR) calculations but does not affect those for displacement. Displacement is literally the volume swept (displaced) by the piston. ^ That is found here. It is a moot point and not trying to start an argument but I don't want people mis-informed. Quote Link to comment Share on other sites More sharing options...
NOHC_WBody Posted July 12, 2003 Report Share Posted July 12, 2003 Whatever. Quote Link to comment Share on other sites More sharing options...
Brian P Posted July 12, 2003 Report Share Posted July 12, 2003 it's a measure of displacement, not volume. Quote Link to comment Share on other sites More sharing options...
SmokesGTP Posted July 12, 2003 Report Share Posted July 12, 2003 Yeah i'm no expert but I think they're right Mike. Quote Link to comment Share on other sites More sharing options...
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