slick Posted November 3, 2003 Report Posted November 3, 2003 Yeah yeah yeah. I kinda stole the title off another topic, oh well. Any ways, when mine craps out (its at 133,xxx right now), i plan on putting a built up 3100 in there. Laugh all you want aaron, it will run good. Ok, so heres a list of stuff i plan on doing: My set of headers im making right now Newer 3100 intake manifolds, gasket matched 5 angle valve job done on the heads Bored .030 over(i'd like to run 9:1 compression, you will see why down the list) Larger TB Have a cam made Centrifugal Supercharger So, i need ideas about the pistons, springs, connecting rods, and all that jazz. Quote
99RegalGS Posted November 3, 2003 Report Posted November 3, 2003 A s/c with 9:1! I could be wrong but isn't that high compresion w/ a s/c. You might have to run with very high octane gas to keep detonation down. The 3800 s/c run 8.5:1. Quote
Robby1870 Posted November 3, 2003 Report Posted November 3, 2003 A s/c with 9:1! I could be wrong but isn't that high compresion w/ a s/c. You might have to run with very high octane gas to keep detonation down. The 3800 s/c run 8.5:1. No, it can be done with 9.1 CR. It all depends on the heads and cam. The 3100 heads are much better than 3.1L heads and should be able to hold some decent boost, properly tuned of course Quote
slick Posted November 3, 2003 Author Report Posted November 3, 2003 Then how should i do the heads to ensure that they can handle the power? What about pistons, rods, springs, etc... Quote
Robby1870 Posted November 3, 2003 Report Posted November 3, 2003 Well, for springs, stock ones are fine unless you get some lifts over .500". Pistons and rods are good for around 300Hp, think. If you want 9.1 CR, just take some material out of the combustion chambers. Not only with it lower your CR, but if you do it right, make the heads hold the boost better Quote
89oldscutlass Posted November 4, 2003 Report Posted November 4, 2003 If your going to build a 3100 make it a stroker motor put a 3400 crank in it. Quote
scorpion_x9 Posted November 4, 2003 Report Posted November 4, 2003 I'd go with forged pistons. I heard the stock pistons are junk and can only take about 40-50 more HP before you push a rod through it. But I could be wrong! Quote
Robby1870 Posted November 4, 2003 Report Posted November 4, 2003 If your going to build a 3100 make it a stroker motor put a 3400 crank in it. 3400 has the same crank and stroke as the 3100, which has the same stroke as the 3.1L Quote
slick Posted November 4, 2003 Author Report Posted November 4, 2003 What is the bore size on my 3100 anyways? Would i have to get custom piston's made, or are there some available that would fit? What type of pistons should i get, like theres flat topped, there are ones that have a bowl type shape, etc... Is there really anything i can do for the crank, or is the stock gonna handle the power fine? Quote
Robby1870 Posted November 4, 2003 Report Posted November 4, 2003 What is the bore size on my 3100 anyways? Would i have to get custom piston's made, or are there some available that would fit? What type of pistons should i get, like theres flat topped, there are ones that have a bowl type shape, etc... Is there really anything i can do for the crank, or is the stock gonna handle the power fine? Your stock bore is 89mm, the 3400 bore is 92mm. Your stock crank should hold up just fine. As for pistons, going with flat tops will give you a rediculously high CR. Get some dished ones where the dish volume is about 1/2 what it is now Quote
slick Posted November 4, 2003 Author Report Posted November 4, 2003 What could i safely bore my engine out to? Is there a company that makes pistons that would fit, or would i have to get them custom made? Quote
Robby1870 Posted November 4, 2003 Report Posted November 4, 2003 I think the max over bore is .060". But I think .040" or 1mm over is plenty. You can get pistons made from any company. Quote
slick Posted November 4, 2003 Author Report Posted November 4, 2003 How much are we talking(money wise) for the custom pistons? Quote
Robby1870 Posted November 4, 2003 Report Posted November 4, 2003 How much are we talking(money wise) for the custom pistons? I have no idea Quote
Guest Gp crazy Posted November 5, 2003 Report Posted November 5, 2003 :shock: $$$$ there are many types and they very in price and diffrent dish sizes (the top of pistion with a pocket in) 8) the price for mine was 350$ :oops:. the cam i am usenig has a max gross lift of .444 it was 167$ with lifters. with block decking and reworking heads and the gaskets it was around 1400$ i though it was a lot but i seen people spend a lot more 8) Quote
slick Posted November 6, 2003 Author Report Posted November 6, 2003 Yeah,i know its a few bucks. Ok, heres more stuff added to my list. If you feel that some things wouldn't benefit me, or if you know of something better say so: Lifter springs(need recomendations) Rocker arms (recomendations) Pushrods(again) Hi-flow fuel pump(again) injectors fuel filter oil pump(should i?) fuel pressure regulator(again) 180 thermostat Quote
brother pig Posted November 6, 2003 Report Posted November 6, 2003 As for pistons, I don't think you'd need to order custom pistons. When I ordered parts for an engine I rebuilt two summers ago, they asked for the type of engine, and then if it was bored over. As long as you stick to "stock" over-bores (.01, .02, .03, etc) they should have pistons for you. I think. They did for me (btw, mine was .03 over) Quote
Robby1870 Posted November 6, 2003 Report Posted November 6, 2003 As long as your total valve lift is less than .500" you dont need springs, stock pushrods are fine, stock rockers are fine, unless you want a higher ratio, and then you're out of luck, unless you want to mess with the guideplates. Everything else is probably a good idea. Oh, Brother Pig, he doesnt want stock pistons, b/c then he will not get the desired compression ratio, although you could run decent boost with stock CR Quote
slick Posted November 6, 2003 Author Report Posted November 6, 2003 Brother pig, where did you order your pistons from? How much were they? Robby, if i can get a cam regrind, do you think that the total valve lift will be over .500? I highly doubt i have a cam regrind done though, unless i will notice the benefits. Quote
Robby1870 Posted November 6, 2003 Report Posted November 6, 2003 Brother pig, where did you order your pistons from? How much were they?Robby, if i can get a cam regrind, do you think that the total valve lift will be over .500? I highly doubt i have a cam regrind done though, unless i will notice the benefits. A cam regrind will not yield total valve lifts over .500 It will change the durations and maybe add some lift. I think its worth it, the durations help out a lot. Either Comp Cams or Crane Cams is currently working on a cam for 3x00s. Wait til it gets done, and see what it looks like Quote
slick Posted November 6, 2003 Author Report Posted November 6, 2003 Ok, sounds good. So i will mark a few more things off of my list. Woo hoo, the price keeps coming down. Quote
Robby1870 Posted November 6, 2003 Report Posted November 6, 2003 Ok, sounds good. So i will mark a few more things off of my list. Woo hoo, the price keeps coming down. If ya got any more questions, just hit me up on MSN Quote
slick Posted November 7, 2003 Author Report Posted November 7, 2003 Ok, sounds good. So i will mark a few more things off of my list. Woo hoo, the price keeps coming down. If ya got any more questions, just hit me up on MSN I added you. I will probably be on all weekend, cuz i will be bored to hell. Quote
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