Ken Numsaki

Sorry Oliver I taked miss writing. DaveBean 576E022 INR Spring coler code is GRAY. not yellow. AND i check bind height is 15mm Regerds Ken from Japan

Hi Oliver VS7 valve spring demention are below. I checked it ( using slide calipers) which in KENT 244 SET. OTR Spring Free height 42 mm (It will be reduce the height(0.2-0.5mm) if spring was full bind) Bind height 20 mm (about) OD 28.6 mm wire diameter 3.75 mm INR Spring (Yellow color painted) Free height 39.8 mm Bind height 16.7 mm (about) OD 21.4 mm wire diameter 2.6 mm I checked other spring from DaveBean (US Lotus parts supplier) Part No 576E0022 are below. OTR Spring (Gray color painted) Free height 42.9 mm Bind height 19.4mm (about) OD 27.5 mm wire diameter 3.6 mm INR Spring (Yellow color painted) Free height 40.8 mm Bind height OD 20.0 mm wire diameter 2.35 mm And I checked VS7 spring rate(the average measured 3 times ), I found interest matter, VS7 spring rate is NOT heavy than normal single spring !! Why?? 🤔 VS7 5 mm bind rode is 14.6Kg 10mm-31.57Kg, 15mm-52.93Kg. OEM 5mm-17.3Kg,10mm-38.8Kg,15mm-62.9Kg 576E 5mm-13.77Kg, 10mm-29.6Kg, 15mm-46.3Kg I'm thinking about which Springs should I choose for new alloy head. So I checked those dimensions yesterday. KEEP KENT KEN

Hi All. Cray, If you get the Alli head and bellhousing, you will be get about 15.5Kg weight reduction. (Alli head-8.9Kg, Bell-6.65Kg non spacer type) It is only? about 2% weight reduction of vehicle, but I think it dose not need for change the dumper setting. Reducing the Z around Inertia, maybe you can get the quick handling! By the way I have a same weight reduction project now. 😬 Parts list as below Alloy head from Dave bean (Pirce manifolds inc. made) -8.9Kg Alloy Flywheel from DB(Fidanza Eng. CO, Ringgear110Teeth) -2.36Kg Alloy Clutch cover Tilton 7.25 in -2.84Kg Starter Lucas T11 to Reduction type T9 -0.9Kg Alloy Bellhousing from Raceline (SPC cast non spacer for short inputshaft T9) -6.65Kg Alloy Main Gearcase from Quaife -4.5Kg Then I get 26Kg weight and 4000$+800ponds money reduction! It's heavy for me. Cray , Please inform to me about alli head modification. I think alli head needs valve spring pocket depth milling for spring as such like VS7 of Kentcams ( in case of 1.69 ratio). It need 2 or 3 mm milling maybe, but I worry about cast wall thickness. Go light head Ken

Hi All. I appreciate your helpful advice. Thank you! To straighten crankshaft reduce the rotational friction of journal,so I wanted to zero runout. I checked my crank straightness again,it center (3rd) journal run out is 0.03mm( total). It means crank bending is 0.015 mm then it is not need to straighten the crank. I studied more. 😬 Bending a nodular cast iron crankshaft is likely to make a risk of cracking. It is because there is no elongation of material that carried out plastic deformation . A fear of making a crack is expected with the material elongation under 2-3%( I think). If it is the material elongation about 10%, I think that correction of a bend can be performed. regards Ken,

Thanks Ade, I will do so. Nodular(ductile) iron has 3-5% elongation characteristic,then I think that maybe can make displacement by press . I will be try it. (and be save money, if...?) Of course, I should be check a cracking, before and after press. regards Ken.

Hi How about the "Dual rock"by 3M or Nylon fastener? It's removal and easy clean up a carpet. http://authoring.3m.com/cms/GB/en/0-165/iRlreFV/view.jhtml?preview=1 http://www.globalsources.com/GeneralManager?page=Browse&action=GetPoint&point_id=3000000151557&catalog_id=2000000003844&country_filt=&state_filt=&design=clean&language=en regards, ken

Hi ALL, I have been rebuild (tune?) a Xflow engine. When I checked the crank straightness, I found that is little bit bend (0.03mm)in the center journal! ☹️ I want to that should be zero runout if I could. Xflow crankshaft was made from nodular cast iron, I think it is not easy to straighten the cast crank such like xflow. Dose anyone had experienced to straighten the nodular cast crank? Please let me know how to straighten the crank. Although I have hydraulic press.... regards. Ken, I will be get 150hp!(may be.. ) 😬

Hi all, Thank you for your kindly reply. I think that heavy flywheel does not have necessity in light weight Seven. Heavy inertia makes easy start for gran mama who drive the normal passenger car. If light FW put on to the normal car, it is very difficult to start the car for lady maybe. But but, seven man has skill and wish more performance to the motor. A heavy flywheel also has a risk of making a crack in the end web ( FW side No8) of a crankshaft. In high rev,Crankshaft is little bit bend then heavy FW makes more stress to the corner(fillet) of No8 web and main journal. As you know,Xflow has Cast crank, so I think light weight FW is good for crank health and me 😬. Moreover, since there is little inertia, I think that a gear shift becomes easy. However, as you taught (thanks everyone ), the problem of a ring gear and a friction should be solved. I should be ask the Dave bean such about risk. Regards

Hi Sin and Angel. Because Seven car weight (under 600Kgw) is lighter than normal passenger car( xflow donor car like cortina), It does not needs height inertia maybe. (And all seven man has good driving skill maybe) 😬 So I think that it can be more lighten the FW inertia for engine pick up. My Iron FW weight is 4.9Kgw( inc clutch weight 10.3Kw). But Ithink that more light FW makes better ebngine response. Dave bean engineering in US. http://www.davebean.com/title.htm It has steel friction plate bolt on.

Hi All. I am thinking about to change the x-flow Iron flywheel to aluminium. Aluminium FW and tilton 7.25 clutch total weight is(about) 12LB!. It will make good engine response by low inertia. However, I am worried about the following. Does anyone have informations? 1.Loosen the flywheel bolts (ali is softer than Iron), Should be use the large steel washer or not? 2.How long the 7.25"metal clutch life? Regards I am making a Light weight Xflow but it needs heavy money. ☹️

From far east to all. (pardon me if I use worng english ) I setted up the Wilwood DYNALITE 4 pots. It weight is 1.15Kg(less pad) and has 35 mm dia piston(2 pistons of cource, made from stainless 1.5 mm thin cup) Disk weight is 3.2Kg with 260 mm dia disk (It has ali bellmount and ventilated) Steel content of Pad (Gatorpad green for semi racing) material is much higher than original. l think it will be hurt the disk easier than original pad. If you change to 4 pod caliper for front, I think you should be better to check about front/rear balance and pedal stroke and foot force. I changed master cylinder dia to 1 inch and teflon brake hose like goodridge. Feeling is much better under normal speed, but in case of racing speed, rear brake does not work well. So I am looking forward to set the big piston for rear (about 34 mm dia) or P valve or balance bar now. by by *thumbup*

Thank again for your helpful reply ,felix. I will be try to make a front mount of starter which you recommend. By the way, I have been thinking about my x-flow (831C AX) to bore up to 1.7L. I would like to get more powers to use Cothworth piston,kent 244 cam and alloy head. And I looking forward to change the bell and gear box to alloy. Then I'll be get about -20Kgw weight reduction and 150HP??( I hope) Now I have been lightened the original conrod weight from 600gw to 535gw ( less bolts and metal ) by removing the square shape metal (balance weight?) of rod. Rod balancing of reciprocating/rotating weight (small end and bigend ) equalize to 162g /383g. It was very tough work for me and very noisy for my wife! Thanks.

Thanks again felix. I understand your opinion. I think so,starter mount seems little bit weak . So So, How about tilton which modified Toyota reduction type starter? I think it is lighter than lucas. thanks

Thanks for the replies guys. I checked and understood at SPC Web that there are two types of ford 5 speed gearbox. My 5s box has short input shaft , then It should be call as Type N ( but I think N means nine? see http://www.domsat.co.uk/pages/gearboxes.htm) . My Input shaft length ( from box side to 15mm guide shaft top) is 175mm ( about 6.9 inches) Type 9 inputshaft is 8.1 inches long !. I think that 6.9 inches shaft is same to the Roket 4 speed. ( I looked it at Quaife america http://www.quaifeamerica.com/technical/tech.htm) So my 5s suit for a short type bell much better( not inc spacer),because of it has short input shaft.Is it sure? Cracking is problem. I think it would be made by heavy iron gear case or only 6 (bolt) points mount to the engine block. I think that is much better to set the bracket( gusset?) between block under side( use oilpan bolt) and bellhausing lower open bolt hole like Tilton? dry sump. Many thanks the UK. *tongue*

Hi Seven pilots. I'd like to change iron cast bellhousing to aluminium bell for weight reduction. My seven does not have a spacer between X-flow( AX block) and Sierra T9 gear box like Caterham. I knew that there are two types of alumi bell in UK, one is standerd other is include 30mm spacer. Does anyone imform to me which type of bell should I purchase? My HEAVY iron bell hight is 7.22" (177mm). Many thanks and happy new year from Japan.