jerrytr5 Posted August 31, 2022 Report Share Posted August 31, 2022 Anyone tell me why the TR7 heater plenum (the plastic clip-on thing in the engine bay) is so big when the air inlet is not much more than 6 x 4 ? The plenum always seems to get in the way - on the Sprint the dizzy fouls it, presume it is worse with a V8. I'm thinking of removing the plenum and feeding the heater with an 'elephants trunk' from under the bumper. Any reason why not? Jerry Quote Link to post Share on other sites
DaveR Posted September 1, 2022 Report Share Posted September 1, 2022 The metal clip-on scoop acts as a water/rain catcher to stop the water flowing onto the engine. Water drains into it both from the bonnet vent and from the windscreen. It always looked like an after thought to me. Dave Quote Link to post Share on other sites
jerrytr5 Posted September 1, 2022 Author Report Share Posted September 1, 2022 Quite right, metal not plastic. Good point about the water drain in front of the screen, I hadn't removed the rubber strip. Wonder why they didn't have a complete flange across that panel, I'll have to block up the slots. Cheers, Jerry. Quote Link to post Share on other sites
keith w Posted September 2, 2022 Report Share Posted September 2, 2022 Interesting you say plastic. I've got a glass fibre one and an original metal one. I hadn't noticed one was slass fibre until I came round to thinking about panel beating it to fit round a V8 with Holley pancake filter. I suspect the fibreglass one is a retro fit. I think I picked it up at an autojumble. Quote Link to post Share on other sites
BusheyTrader Posted September 4, 2022 Report Share Posted September 4, 2022 (edited) The plenum keeps the under bonnet air away from entering the car’s heater / fresh air intake… The large pancake filters on top of a Holley / Edelbrock equipped V8 often require some fettling and welding to the plenum for clearance. Edited September 4, 2022 by BusheyTrader Air filter note Quote Link to post Share on other sites
BlueTR3A-5EKT Posted September 4, 2022 Report Share Posted September 4, 2022 (edited) This item along with a dip stick were our biggest selling wedge items after obvious routine service parts. The plenum was clearly left off and lost or placed under the car by the service department mechanic and then run over. Why the dip stick? We think owners never put them back in the engine tubes properly after checking their oil, so they just fell to the ground under the car. The other item that was a good seller was the plastic strap for the glove box door Edited September 4, 2022 by BlueTR3A-5EKT Quote Link to post Share on other sites
jerrytr5 Posted October 7, 2022 Author Report Share Posted October 7, 2022 (edited) Decided to discard the plenum and fit a scoop under the front bumper along with an elephants trunk to a custom adaptor over the heater intake. Made a GRP heater intake adaptor whichj looks like this: Fitted over the heater intake Edited October 7, 2022 by jerrytr5 multiple images - why? how? Quote Link to post Share on other sites
BlueTR3A-5EKT Posted October 8, 2022 Report Share Posted October 8, 2022 11 hours ago, jerrytr5 said: Decided to discard the plenum and fit a scoop under the front bumper along with an elephants trunk to a custom adaptor over the heater intake. Made a GRP heater intake adaptor whichj looks like this: Fitted over the heater intake Nice mod. Quote Link to post Share on other sites
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