HI PSI Member 1,589 Member For: 19y 3d Gender: Male Location: Central Queensland Posted 16/07/08 09:14 AM Share Posted 16/07/08 09:14 AM Due to Fords lack of Short engines. I will be building a forged bottom end. A much etter choice I know. However I wasn't really planning on running into the 400's anyway. I am probably going to look at the Atomic rebuild kit. I have decided to go along this path as I have read that some Atomic engines are noisy and that Nispro are not interested in building short motor. I am a very fussy/fastidious person and I want a reliable engine around the 400 Rwkw range that is quiet. Any advice and specifications that anyone could give me would be greatly appreciated. I am sure that there are many forum members that would be immensly interested in this topic. Your input from experiences or knowledge will be greatly appreciated.... Link to comment https://www.fordxr6turbo.com/forum/topic/47675-forged-engine-components-tolerances/ Share on other sites More sharing options...
rapidchris Member 314 Member For: 19y 10m 4d Gender: Male Location: brisbane Posted 16/07/08 09:44 AM Share Posted 16/07/08 09:44 AM ive had a atomic bottom end. it was the worst thing ive ever done. it was shooking on noise at the least Link to comment https://www.fordxr6turbo.com/forum/topic/47675-forged-engine-components-tolerances/#findComment-706486 Share on other sites More sharing options...
HI PSI Member 1,589 Member For: 19y 3d Gender: Male Location: Central Queensland Posted 16/07/08 09:52 AM Author Share Posted 16/07/08 09:52 AM Is this due to the piston that they are using? Or the tollerances??? Link to comment https://www.fordxr6turbo.com/forum/topic/47675-forged-engine-components-tolerances/#findComment-706492 Share on other sites More sharing options...
ratter Member 6,793 Member For: 19y 1d Gender: Male Location: @ my laptop Posted 16/07/08 10:15 AM Share Posted 16/07/08 10:15 AM Forged pistons have quite a bit of growth with different temperatures, so a lot of older forged piston motors used to have large piston to bore clearances which made them quite noisey when cold. I'm sure things have changed these days, but you will need to match specs up with who evers gear you run Link to comment https://www.fordxr6turbo.com/forum/topic/47675-forged-engine-components-tolerances/#findComment-706507 Share on other sites More sharing options...
HI PSI Member 1,589 Member For: 19y 3d Gender: Male Location: Central Queensland Posted 16/07/08 10:32 AM Author Share Posted 16/07/08 10:32 AM (edited) Quote "ive had a atomic bottom end. it was the worst thing ive ever done. it was shooking on noise at the least" Quote When was you engine built RAPIDCHRIS ?????I imagine that more than 90% of the members here that have an atomic engine purchased it as a short engine. It seems that a few members are extremely unhappy about the noise the engine makes. I spoke to Atomic a few days ago about their shorts. They are new cranks and sonic tested blocks. It would be fair to say that they build their engines to their designed specifications. So is it a design flaw in their pistons or the tollerances that they are using??? Could it be poor workmanship?? Could finer tollerances solve the issue?Do members that built their own engine from Atomic rebuild kits have the same problem?These are the questions that I need to be answered. Edited 16/07/08 10:35 AM by HI PSI Link to comment https://www.fordxr6turbo.com/forum/topic/47675-forged-engine-components-tolerances/#findComment-706515 Share on other sites More sharing options...
ETM Member 1,194 Member For: 18y 2m 15d Gender: Male Location: syd south Posted 16/07/08 10:43 AM Share Posted 16/07/08 10:43 AM mate just buy a set of cp pistons and some h-beam rods and your engine builder can easily sort the rest out.The cp pistons come with a spec sheet that tells you everything you and your machinist need to know for a perfect installation. Link to comment https://www.fordxr6turbo.com/forum/topic/47675-forged-engine-components-tolerances/#findComment-706525 Share on other sites More sharing options...
HI PSI Member 1,589 Member For: 19y 3d Gender: Male Location: Central Queensland Posted 16/07/08 10:55 AM Author Share Posted 16/07/08 10:55 AM Could you possibly tell me where you sourced yours from?? Link to comment https://www.fordxr6turbo.com/forum/topic/47675-forged-engine-components-tolerances/#findComment-706531 Share on other sites More sharing options...
strik9 Banned 146 Member For: 18y 20d Gender: Male Location: AUSTRALIA Posted 16/07/08 09:47 PM Share Posted 16/07/08 09:47 PM ETM said: mate just buy a set of cp pistons and some h-beam rods and your engine builder can easily sort the rest out.The cp pistons come with a spec sheet that tells you everything you and your machinist need to know for a perfect installation.yeah what he said. rocket industries has a heap of gear. though have never used them Link to comment https://www.fordxr6turbo.com/forum/topic/47675-forged-engine-components-tolerances/#findComment-706646 Share on other sites More sharing options...
ETM Member 1,194 Member For: 18y 2m 15d Gender: Male Location: syd south Posted 16/07/08 10:11 PM Share Posted 16/07/08 10:11 PM I got my cp pistons and spool rods from brad at www.spoolimports.com Link to comment https://www.fordxr6turbo.com/forum/topic/47675-forged-engine-components-tolerances/#findComment-706649 Share on other sites More sharing options...
FSIX Member 566 Member For: 19y 7m 3d Posted 17/07/08 02:41 AM Share Posted 17/07/08 02:41 AM My bottom end was build last week by Autotech Engineering, no noise not even when cold, its as quiet as the factory engine was.They used JE Pistons, there is a full write up on specs in the Autotech sponsor Forum if interested having a read.We are lucky to have many choices of hardware to pick from these days.Good luck Link to comment https://www.fordxr6turbo.com/forum/topic/47675-forged-engine-components-tolerances/#findComment-706715 Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now