JochemsTR Posted November 15, 2020 Report Share Posted November 15, 2020 Sorry.....I meant China....(CN) Quote Link to post Share on other sites
stillp Posted November 15, 2020 Report Share Posted November 15, 2020 OK, sorry for my nit-picking, I used to do it for a living! Pete Quote Link to post Share on other sites
Hamish Posted November 15, 2020 Report Share Posted November 15, 2020 10 minutes ago, stillp said: OK, sorry for my nit-picking, I used to do it for a living! Pete School nit nurse Pete ?? Quote Link to post Share on other sites
Lebro Posted November 16, 2020 Report Share Posted November 16, 2020 (edited) On 11/13/2020 at 6:35 PM, BlueTR3A-5EKT said: Maxpeeding rods enclosed instruction leaflet mention 45 ft lbs torque using ARP lube - what is this and where is it obtained. What torque have others used and what process? Some measurements of what we have - The Maxpeeding con rods all come in at 658 grms each. (about 2/3 the weight of original lightened con rods) The lightened and balanced original TR4A con rod set we have, that were done by Osselli, weigh 940 grms each. The Power Max 87 mm pistons come in at 660 grms each. Cheers Peter W https://www.highliftmedia.com/big-end-bolts-torquestretch-guide-how-to/ Lots of information here. I don't know how the stretch gauge works they talk about - maybe it is just a rotation indicator based on the pitch of the thread ? Looking at the chart, for our bolts 3/8" X 24 TPI you can use stretch figures OR torque figures (32ft lb) which is close to the Maxspeedingrods figure of 45 ftlbs Of course we don't know what material they have used. Bob Edited November 23, 2020 by Lebro Quote Link to post Share on other sites
stillp Posted November 16, 2020 Report Share Posted November 16, 2020 12 hours ago, Hamish said: School nit nurse Pete ?? Well, I was a proof-reader for a while in my late teens, and from the early 80s until I retired in 2016 spent a lot of time drafting International Standards. Pete Quote Link to post Share on other sites
BlueTR3A-5EKT Posted November 16, 2020 Report Share Posted November 16, 2020 (edited) 1 hour ago, Lebro said: https://www.highliftmedia.com/big-end-bolts-torquestretch-guide-how-to/ Lots of information here. I don't know how the stretch gauge works they talk about - matbe it is just a rtation indicator based on the pitch of the thread ? Looking at the chart, for our bolts 5/16" X 1.5" you can use stretch figures OR torque figures (32ft lb) which is close to the Maxspeedingrods figure of 28 ftlbs Of course we don't know what material they have used. Bob Thank you Bob for that link. Now I understand I feel an hour in the workshop due to make one of these. Peter W Edited November 16, 2020 by BlueTR3A-5EKT Quote Link to post Share on other sites
Lebro Posted November 16, 2020 Report Share Posted November 16, 2020 (edited) I see, you would need access to the bottom of the bolt, ok for con rods but no good for head bolts. I will check on the pitch of our bolts, & calculate how much to turn it (once slack is taken out) to achieve the required stretch, while noting the torque being applied, & stopping if it exceeds 30 ftlb Edited November 16, 2020 by Lebro Quote Link to post Share on other sites
Ian Vincent Posted November 16, 2020 Author Report Share Posted November 16, 2020 When I worked as a civil engineer using HSFG bolts we preferred either Load Indicating Bolts (LIB), LI washers or the part turn method for accurately measuring the clamping force of the bolts. So in this instance I’d opt for the part turn method. Rgds Ian Quote Link to post Share on other sites
Lebro Posted November 21, 2020 Report Share Posted November 21, 2020 OK, so the Maxspeeding rods for our cars use 3/8" UNF ARP 2000 bolts, which according to both the instructions which came with them, & a table found on here : https://www.highliftmedia.com/big-end-bolts-torquestretch-guide-how-to/ should be stretched by 5½ to 6 thou. The pitch of a 3/8"UNF bolt is 0.041667", so divide that by say 5.8 thou gives 7.18391 divide 360 by 7.18391 gives 50° so follow the instructions in the link above, then rotate the head by 50° to get the required stretch. Bob. Quote Link to post Share on other sites
Ian Vincent Posted November 21, 2020 Author Report Share Posted November 21, 2020 Works for me Bob. Rgds Ian Quote Link to post Share on other sites
Lebro Posted November 23, 2020 Report Share Posted November 23, 2020 On 11/13/2020 at 6:35 PM, BlueTR3A-5EKT said: Some measurements of what we have - The Maxpeeding con rods all come in at 658 grms each. (about 2/3 the weight of original lightened con rods) The lightened and balanced original TR4A con rod set we have, that were done by Osselli, weigh 940 grms each. The Power Max 87 mm pistons come in at 660 grms each. Cheers Peter W For information, I have just been weighing & balancing pistons & conrods. Pistons (87mm from TR shop) 674 to 678 g, now all 674 (metal taken from the base to equalise) Conrods (Maxspeedingrods) all 650 g nothing to do. Bob. Quote Link to post Share on other sites
Hamish Posted November 23, 2020 Report Share Posted November 23, 2020 (edited) Are they standard shape pistons Bob ? Or something a bit more special ? Edited November 23, 2020 by Hamish Quote Link to post Share on other sites
Lebro Posted November 23, 2020 Report Share Posted November 23, 2020 Nothing special Hamish, just a cylinder. Those weights include the gudgeon pin. Bob Quote Link to post Share on other sites
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