JohnCh

15-20% is the range bandied about on the Internet, but there are simply too many variables to have an accurate, universal number. Different dyno types and brands, different correction factors on the same dyno model, different rolling resistance of tires based on rubber compound, carcass construction, and air pressure, how tightly the straps are pulling the tires down against the rollers, the car itself (longitudinal vs transverse engine, transaxle vs. transmission + diff) etc. My primary dyno facility has a lot of experience running the same engine on an engine dyno followed by installing it in the car then running on their old Dynojet. They typically see a 15-18% loss depending on variables, and said a car like ours is generally at the top end of that range. But again, that number is specific to their dyno and is subject to error. Interestingly, dyno shops in the UK generally perform a coast down measurement to account for most of the systemic losses above and produce a corrected, at the flywheel number specific to that dyno session. However, in the US that methodology is generally considered flawed and is rarely used. Apparently the preferred temperature of our beer isn't the only head scratching difference between our two cultures. As for Duratec vs. Zetec, I agree with you 100%. Yes, a Duratec has more power potential and is lighter, but the Zetec can clearly produce a lot of reliable horsepower and isn't exactly a boat anchor. If you already have a Zetec, I'm not sure the conversion hassles outweigh the gains. -John

Really impressive results. I'm curious to see how the exhaust change affects the shape and height of the torque curve. Did they share the specs of the dyno exhaust so you know how it differs from the one you will use? -John

If you like the older style round tail lights, the Land Rover units are another easy to find option. -John

If no one here has a source for the ones used by Caterham, measure the head diameter (might be metric) then check out the sizes available at McMaster Carr: https://www.mcmaster.com/rivets/ Lots to choose from so you should be able to get exactly what you need or at least very, very close. -John

Some of this may be identified in the various books available on the model, but no idea which one(s) is best from this perspective. Others may know. BTW If you haven't seen it, @Croc posted a reading list article that is a great reference of published materials: -John

Word choice is important in marketing. They state it's "our lightest production seven of all time." i.e. it's Caterham's lightest seven, not the lightest seven made by Lotus. Although Caterham bought the design rights from Lotus, they have no claims on the sevens produced by that company. -John

Thanks for following back up with this information. I'll keep it in mind when it's time to register my new build next summer. As for missing out on the Stalker, don't give up and make sure to follow @Croc's thread which is updated each weekend. It's the best place to find a se7en listed for sale in the US or Canada. -John

Hi Dave, I just checked and it looks like you've exceeded your PM storage limit of 50 messages (you have 54) so you will need to delete some to reenable the PM function for your account. And to avoid confusion for others who read this, Paid Club Members have a limit of 500. -John

Exactly what I needed, thank you! -John

Does anyone know the footprint dimensions of the SV fuel tank? For my build I'm investigating using the Holley HydraMat as part of the upgraded fuel delivery system and need to figure out which model is the best fit given the size of the tank's floor. Thanks, John

This is one of those items where Caterham may still be able to get it but don't add it to the online store. Might be worth a call to ask. Regarding other sources, I know both SVC and Car Builder Solutions in the UK carry that style in that size, but they might differ slightly from the Caterham version. -John

Looks like a fun car, particularly at that weight and with those tires. Side note: it's interesting Caterham is choosing to show the car on their website in what appears to be a paint-to-sample color rather than any of the options listed on the site. Is that the case, or is this an unintentional leak of paint options changing for 2022 cars? Thanks, John

There are at least two other people here with the good sense to own both a se7en and an Elan. Great looking car and color. Once you get a chance to really know it, I'd be curious to hear your impressions of how it compares to the Elan, and Europa. -John

As I wrote above, I checked several of your images and some were uploaded from your device and some were linked from other sources (e.g. EVO Magazine). The images that are broken all point to a CDN, which seems to indicate those images were remotely hosted. If you have any instances where you have uploaded an image and it is no longer appearing, let me know via PM and I can open a ticket. Regarding remote images (what you refer to as hotlinking) those are not hosted by our servers and that is not unique to our software. Think back to when PhotoBucket changed their terms several years ago and broke images across various forums. If the source image moves or is blocked, there is nothing for the forum to display. I did a quick test and it doesn't appear that the original URL is viewable when in edit mode other than showing the CDN link. -John

@Vovchandrit looks like some of your photos were image uploads to the forum and others were URLs with the image hosted elsewhere. The items that aren't appearing all seem to be the latter (or at least the several I looked at) and show as URL expired with that URL pointing to a content delivery network affiliated with Facebook. If I were to hazard a guess, it might be related to copyright protection given those images were most likely taken by professional photographers. -John

I changed a setting. You should now have permissions to edit your original post. -John

Croc might be able to supply a copy of the police report. Pretty sure they took photos. -John

Apparently he was not amused that I put a license plate frame on CatKong that read "I'd rather be driving a Westfield." He indicated the dogs could still fly on the corporate jet, but I had to go commercial. -John

Paul, I bet he planned that trip a little further ahead than Track Day Eve -John

I'm getting excited for this event even though I'm following it from the other side of the country. Make sure to take plenty of photos for the club's Instagram account! -John

Hopefully others will chime in with US or Canadian suppliers, but if you are looking at UK options, silencers from Westfield (the carbon fiber unit), Wunoff, and Simpson all get great reviews on WSCC. The Raceco is also excellent, but it's a bit spendy (Titanium ain't cheap). -John

Glad to hear you're pleased. For the half hood, I would go with Soft Bits for Sevens, but confirm measurements of your specific car with them. There can be some minor variations in the top of windscreen to roll bar distance on cars from this era. BTW it looks like you have the RAC roll bar vs. the stock item. They will need to know that to ensure you get the right top. -John

Hi Jim, I have the email address of the person at Oxted who normally handles these types of requests if you aren't having much luck with their online form or their info@ email box. Happy to shoot that to you via PM if you think it will help. -John

We weren't sure if you were running a distributor or wasted spark. If the former, then the question was ignition advance, if the latter, a failing coil pack could be part of the problem. I've had two of the Ford units fail over the years.

It would be good to know if something happened at the 20 second mark of the video. Did the sound suddenly change or is that just a recording artifact? When you write that #4 is colder than the rest, how much colder? Dead cylinder colder or misfiring cylinder colder? Given the history here, you might be looking at a few minor things being off rather than just one. i.e. I don't think Occam's Razor applies to your engine. The Persian house cats are now fed and they are rooting for you. -John